xslt.c

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/*
 * xslt.c: Implemetation of an XSL Transformation 1.0 engine
 *
 * Reference:
 *   XSLT specification
 *   http://www.w3.org/TR/1999/REC-xslt-19991116
 *
 *   Associating Style Sheets with XML documents
 *   http://www.w3.org/1999/06/REC-xml-stylesheet-19990629
 *
 * See Copyright for the status of this software.
 *
 * daniel@veillard.com
 */

#define IN_LIBXSLT
#include "libxslt.h"

#include <string.h>

#include <libxml/xmlmemory.h>
#include <libxml/parser.h>
#include <libxml/tree.h>
#include <libxml/valid.h>
#include <libxml/hash.h>
#include <libxml/uri.h>
#include <libxml/xmlerror.h>
#include <libxml/parserInternals.h>
#include <libxml/xpathInternals.h>
#include <libxml/xpath.h>
#include "xslt.h"
#include "xsltInternals.h"
#include "pattern.h"
#include "variables.h"
#include "namespaces.h"
#include "attributes.h"
#include "xsltutils.h"
#include "imports.h"
#include "keys.h"
#include "documents.h"
#include "extensions.h"
#include "preproc.h"
#include "extra.h"
#include "security.h"

#ifdef WITH_XSLT_DEBUG
#define WITH_XSLT_DEBUG_PARSING
/* #define WITH_XSLT_DEBUG_BLANKS */
#endif

const char *xsltEngineVersion = LIBXSLT_VERSION_STRING LIBXSLT_VERSION_EXTRA;
const int xsltLibxsltVersion = LIBXSLT_VERSION;
const int xsltLibxmlVersion = LIBXML_VERSION;

#ifdef XSLT_REFACTORED

const xmlChar *xsltConstNamespaceNameXSLT = (const xmlChar *) XSLT_NAMESPACE;

#define XSLT_ELEMENT_CATEGORY_XSLT 0
#define XSLT_ELEMENT_CATEGORY_EXTENSION 1
#define XSLT_ELEMENT_CATEGORY_LRE 2

/*
* xsltLiteralResultMarker:
* Marker for Literal result elements, in order to avoid multiple attempts
* to recognize such elements in the stylesheet's tree.
* This marker is set on node->psvi during the initial traversal
* of a stylesheet's node tree.
*
const xmlChar *xsltLiteralResultMarker =
    (const xmlChar *) "Literal Result Element";
*/

/*
* xsltXSLTTextMarker:
* Marker for xsl:text elements. Used to recognize xsl:text elements
* for post-processing of the stylesheet's tree, where those
* elements are removed from the tree.
*/
const xmlChar *xsltXSLTTextMarker = (const xmlChar *) "XSLT Text Element";

/*
* xsltXSLTAttrMarker:
* Marker for XSLT attribute on Literal Result Elements.
*/
const xmlChar *xsltXSLTAttrMarker = (const xmlChar *) "LRE XSLT Attr";

#endif

#ifdef XSLT_LOCALE_WINAPI
extern xmlRMutexPtr xsltLocaleMutex;
#endif
/*
 * Harmless but avoiding a problem when compiling against a
 * libxml <= 2.3.11 without LIBXML_DEBUG_ENABLED
 */
#ifndef LIBXML_DEBUG_ENABLED
double xmlXPathStringEvalNumber(const xmlChar *str);
#endif
/*
 * Useful macros
 */

#ifdef  IS_BLANK
#undef  IS_BLANK
#endif
#define IS_BLANK(c) (((c) == 0x20) || ((c) == 0x09) || ((c) == 0xA) ||  \
                     ((c) == 0x0D))

#ifdef  IS_BLANK_NODE
#undef  IS_BLANK_NODE
#endif
#define IS_BLANK_NODE(n)                        \
    (((n)->type == XML_TEXT_NODE) && (xsltIsBlank((n)->content)))

static void
xsltParseContentError(xsltStylesheetPtr style,
               xmlNodePtr node)
{
    if ((style == NULL) || (node == NULL))
    return;

    if (IS_XSLT_ELEM(node))
    xsltTransformError(NULL, style, node,
        "The XSLT-element '%s' is not allowed at this position.\n",
        node->name);
    else
    xsltTransformError(NULL, style, node,
        "The element '%s' is not allowed at this position.\n",
        node->name);
    style->errors++;
}

#ifdef XSLT_REFACTORED
#else

static int
exclPrefixPush(xsltStylesheetPtr style, xmlChar * value)
{
    int i;

    if (style->exclPrefixMax == 0) {
        style->exclPrefixMax = 4;
        style->exclPrefixTab =
            (xmlChar * *)xmlMalloc(style->exclPrefixMax *
                                   sizeof(style->exclPrefixTab[0]));
        if (style->exclPrefixTab == NULL) {
            xmlGenericError(xmlGenericErrorContext, "malloc failed !\n");
            return (-1);
        }
    }
    /* do not push duplicates */
    for (i = 0;i < style->exclPrefixNr;i++) {
        if (xmlStrEqual(style->exclPrefixTab[i], value))
        return(-1);
    }
    if (style->exclPrefixNr >= style->exclPrefixMax) {
        style->exclPrefixMax *= 2;
        style->exclPrefixTab =
            (xmlChar * *)xmlRealloc(style->exclPrefixTab,
                                    style->exclPrefixMax *
                                    sizeof(style->exclPrefixTab[0]));
        if (style->exclPrefixTab == NULL) {
            xmlGenericError(xmlGenericErrorContext, "realloc failed !\n");
            return (-1);
        }
    }
    style->exclPrefixTab[style->exclPrefixNr] = value;
    style->exclPrefix = value;
    return (style->exclPrefixNr++);
}
static xmlChar *
exclPrefixPop(xsltStylesheetPtr style)
{
    xmlChar *ret;

    if (style->exclPrefixNr <= 0)
        return (0);
    style->exclPrefixNr--;
    if (style->exclPrefixNr > 0)
        style->exclPrefix = style->exclPrefixTab[style->exclPrefixNr - 1];
    else
        style->exclPrefix = NULL;
    ret = style->exclPrefixTab[style->exclPrefixNr];
    style->exclPrefixTab[style->exclPrefixNr] = 0;
    return (ret);
}
#endif

/************************************************************************
 *                                  *
 *          Helper functions                *
 *                                  *
 ************************************************************************/

static int initialized = 0;
void
xsltInit (void) {
    if (initialized == 0) {
    initialized = 1;
#ifdef XSLT_LOCALE_WINAPI
    xsltLocaleMutex = xmlNewRMutex();
#endif
        xsltRegisterAllExtras();
    }
}

void
xsltUninit (void) {
    initialized = 0;
}

int
xsltIsBlank(xmlChar *str) {
    if (str == NULL)
    return(1);
    while (*str != 0) {
    if (!(IS_BLANK(*str))) return(0);
    str++;
    }
    return(1);
}

/************************************************************************
 *                                  *
 *      Routines to handle XSLT data structures         *
 *                                  *
 ************************************************************************/
static xsltDecimalFormatPtr
xsltNewDecimalFormat(xmlChar *name)
{
    xsltDecimalFormatPtr self;
    /* UTF-8 for 0x2030 */
    static const xmlChar permille[4] = {0xe2, 0x80, 0xb0, 0};

    self = xmlMalloc(sizeof(xsltDecimalFormat));
    if (self != NULL) {
    self->next = NULL;
    self->name = name;
    
    /* Default values */
    self->digit = xmlStrdup(BAD_CAST("#"));
    self->patternSeparator = xmlStrdup(BAD_CAST(";"));
    self->decimalPoint = xmlStrdup(BAD_CAST("."));
    self->grouping = xmlStrdup(BAD_CAST(","));
    self->percent = xmlStrdup(BAD_CAST("%"));
    self->permille = xmlStrdup(BAD_CAST(permille));
    self->zeroDigit = xmlStrdup(BAD_CAST("0"));
    self->minusSign = xmlStrdup(BAD_CAST("-"));
    self->infinity = xmlStrdup(BAD_CAST("Infinity"));
    self->noNumber = xmlStrdup(BAD_CAST("NaN"));
    }
    return self;
}

static void
xsltFreeDecimalFormat(xsltDecimalFormatPtr self)
{
    if (self != NULL) {
    if (self->digit)
        xmlFree(self->digit);
    if (self->patternSeparator)
        xmlFree(self->patternSeparator);
    if (self->decimalPoint)
        xmlFree(self->decimalPoint);
    if (self->grouping)
        xmlFree(self->grouping);
    if (self->percent)
        xmlFree(self->percent);
    if (self->permille)
        xmlFree(self->permille);
    if (self->zeroDigit)
        xmlFree(self->zeroDigit);
    if (self->minusSign)
        xmlFree(self->minusSign);
    if (self->infinity)
        xmlFree(self->infinity);
    if (self->noNumber)
        xmlFree(self->noNumber);
    if (self->name)
        xmlFree(self->name);
    xmlFree(self);
    }
}

static void
xsltFreeDecimalFormatList(xsltStylesheetPtr self)
{
    xsltDecimalFormatPtr iter;
    xsltDecimalFormatPtr tmp;

    if (self == NULL)
    return;
    
    iter = self->decimalFormat;
    while (iter != NULL) {
    tmp = iter->next;
    xsltFreeDecimalFormat(iter);
    iter = tmp;
    }
}

xsltDecimalFormatPtr
xsltDecimalFormatGetByName(xsltStylesheetPtr style, xmlChar *name)
{
    xsltDecimalFormatPtr result = NULL;

    if (name == NULL)
    return style->decimalFormat;

    while (style != NULL) {
    for (result = style->decimalFormat->next;
         result != NULL;
         result = result->next) {
        if (xmlStrEqual(name, result->name))
        return result;
    }
    style = xsltNextImport(style);
    }
    return result;
}


static xsltTemplatePtr
xsltNewTemplate(void) {
    xsltTemplatePtr cur;

    cur = (xsltTemplatePtr) xmlMalloc(sizeof(xsltTemplate));
    if (cur == NULL) {
    xsltTransformError(NULL, NULL, NULL,
        "xsltNewTemplate : malloc failed\n");
    return(NULL);
    }
    memset(cur, 0, sizeof(xsltTemplate));
    cur->priority = XSLT_PAT_NO_PRIORITY;
    return(cur);
}

static void
xsltFreeTemplate(xsltTemplatePtr template) {
    if (template == NULL)
    return;
    if (template->match) xmlFree(template->match);
/*
*   NOTE: @name and @nameURI are put into the string dict now.
*   if (template->name) xmlFree(template->name);
*   if (template->nameURI) xmlFree(template->nameURI);
*/
/*
    if (template->mode) xmlFree(template->mode);
    if (template->modeURI) xmlFree(template->modeURI);
 */
    if (template->inheritedNs) xmlFree(template->inheritedNs);
    memset(template, -1, sizeof(xsltTemplate));
    xmlFree(template);
}

static void
xsltFreeTemplateList(xsltTemplatePtr template) {
    xsltTemplatePtr cur;

    while (template != NULL) {
    cur = template;
    template = template->next;
    xsltFreeTemplate(cur);
    }
}

#ifdef XSLT_REFACTORED

static void
xsltFreeNsAliasList(xsltNsAliasPtr item)
{
    xsltNsAliasPtr tmp;
    
    while (item) {
    tmp = item;
    item = item->next;
    xmlFree(tmp);
    } 
    return;
}

#ifdef XSLT_REFACTORED_XSLT_NSCOMP
static void
xsltFreeNamespaceMap(xsltNsMapPtr item)
{
    xsltNsMapPtr tmp;
    
    while (item) {
    tmp = item;
    item = item->next;
    xmlFree(tmp);
    } 
    return;
}

static xsltNsMapPtr
xsltNewNamespaceMapItem(xsltCompilerCtxtPtr cctxt,
            xmlDocPtr doc,
            xmlNsPtr ns,
            xmlNodePtr elem)
{
    xsltNsMapPtr ret;

    if ((cctxt == NULL) || (doc == NULL) || (ns == NULL))
    return(NULL);

    ret = (xsltNsMapPtr) xmlMalloc(sizeof(xsltNsMap));
    if (ret == NULL) {
    xsltTransformError(NULL, cctxt->style, elem,
        "Internal error: (xsltNewNamespaceMapItem) "
        "memory allocation failed.\n");
    return(NULL);
    }
    memset(ret, 0, sizeof(xsltNsMap));
    ret->doc = doc;
    ret->ns = ns;
    ret->origNsName = ns->href;
    /*
    * Store the item at current stylesheet-level.
    */
    if (cctxt->psData->nsMap != NULL)
    ret->next = cctxt->psData->nsMap;
    cctxt->psData->nsMap = ret;

    return(ret);
}
#endif /* XSLT_REFACTORED_XSLT_NSCOMP */

static void
xsltCompilerVarInfoFree(xsltCompilerCtxtPtr cctxt)
{
    xsltVarInfoPtr ivar = cctxt->ivars, ivartmp;    

    while (ivar) {
    ivartmp = ivar;
    ivar = ivar->next;
    xmlFree(ivartmp);
    }
}

static void
xsltCompilationCtxtFree(xsltCompilerCtxtPtr cctxt)
{    
    if (cctxt == NULL)
    return;
#ifdef WITH_XSLT_DEBUG_PARSING
    xsltGenericDebug(xsltGenericDebugContext,
    "Freeing compilation context\n");
    xsltGenericDebug(xsltGenericDebugContext,
    "### Max inodes: %d\n", cctxt->maxNodeInfos);
    xsltGenericDebug(xsltGenericDebugContext,
    "### Max LREs  : %d\n", cctxt->maxLREs);
#endif
    /*
    * Free node-infos.
    */
    if (cctxt->inodeList != NULL) {
    xsltCompilerNodeInfoPtr tmp, cur = cctxt->inodeList;
    while (cur != NULL) {
        tmp = cur;
        cur = cur->next;
        xmlFree(tmp);
    }
    }
    if (cctxt->tmpList != NULL)
    xsltPointerListFree(cctxt->tmpList);
#ifdef XSLT_REFACTORED_XPATHCOMP
    if (cctxt->xpathCtxt != NULL)
    xmlXPathFreeContext(cctxt->xpathCtxt);
#endif
    if (cctxt->nsAliases != NULL)
    xsltFreeNsAliasList(cctxt->nsAliases);

    if (cctxt->ivars)
    xsltCompilerVarInfoFree(cctxt);

    xmlFree(cctxt);
}

static xsltCompilerCtxtPtr
xsltCompilationCtxtCreate(xsltStylesheetPtr style) {
    xsltCompilerCtxtPtr ret;

    ret = (xsltCompilerCtxtPtr) xmlMalloc(sizeof(xsltCompilerCtxt));
    if (ret == NULL) {
    xsltTransformError(NULL, style, NULL,
        "xsltCompilerCreate: allocation of compiler "
        "context failed.\n");
    return(NULL);
    }
    memset(ret, 0, sizeof(xsltCompilerCtxt));

    ret->errSeverity = XSLT_ERROR_SEVERITY_ERROR;
    ret->tmpList = xsltPointerListCreate(20);
    if (ret->tmpList == NULL) {
    goto internal_err;
    }
#ifdef XSLT_REFACTORED_XPATHCOMP
    /*
    * Create the XPath compilation context in order
    * to speed up precompilation of XPath expressions.
    */
    ret->xpathCtxt = xmlXPathNewContext(NULL);
    if (ret->xpathCtxt == NULL)
    goto internal_err;
#endif
    
    return(ret);

internal_err:
    xsltCompilationCtxtFree(ret);
    return(NULL);
}

static void
xsltLREEffectiveNsNodesFree(xsltEffectiveNsPtr first)
{
    xsltEffectiveNsPtr tmp;

    while (first != NULL) {
    tmp = first;
    first = first->nextInStore;
    xmlFree(tmp);
    }
}

static void
xsltFreePrincipalStylesheetData(xsltPrincipalStylesheetDataPtr data)
{
    if (data == NULL)
    return;

    if (data->inScopeNamespaces != NULL) {
    int i;
    xsltNsListContainerPtr nsi;
    xsltPointerListPtr list =
        (xsltPointerListPtr) data->inScopeNamespaces;

    for (i = 0; i < list->number; i++) {
        /*
        * REVISIT TODO: Free info of in-scope namespaces.
        */
        nsi = (xsltNsListContainerPtr) list->items[i];
        if (nsi->list != NULL)
        xmlFree(nsi->list);
        xmlFree(nsi);
    }
    xsltPointerListFree(list);
    data->inScopeNamespaces = NULL;
    }

    if (data->exclResultNamespaces != NULL) {
    int i;
    xsltPointerListPtr list = (xsltPointerListPtr)
        data->exclResultNamespaces; 
    
    for (i = 0; i < list->number; i++)
        xsltPointerListFree((xsltPointerListPtr) list->items[i]);
    
    xsltPointerListFree(list);
    data->exclResultNamespaces = NULL;
    }

    if (data->extElemNamespaces != NULL) {
    xsltPointerListPtr list = (xsltPointerListPtr)
        data->extElemNamespaces;
    int i;

    for (i = 0; i < list->number; i++)
        xsltPointerListFree((xsltPointerListPtr) list->items[i]);

    xsltPointerListFree(list);
    data->extElemNamespaces = NULL;
    }
    if (data->effectiveNs) {
    xsltLREEffectiveNsNodesFree(data->effectiveNs);
    data->effectiveNs = NULL;
    }
#ifdef XSLT_REFACTORED_XSLT_NSCOMP
    xsltFreeNamespaceMap(data->nsMap);
#endif
    xmlFree(data);
}

static xsltPrincipalStylesheetDataPtr
xsltNewPrincipalStylesheetData(void)
{
    xsltPrincipalStylesheetDataPtr ret;

    ret = (xsltPrincipalStylesheetDataPtr)
    xmlMalloc(sizeof(xsltPrincipalStylesheetData));
    if (ret == NULL) {
    xsltTransformError(NULL, NULL, NULL,
        "xsltNewPrincipalStylesheetData: memory allocation failed.\n");
    return(NULL);
    }
    memset(ret, 0, sizeof(xsltPrincipalStylesheetData));
    
    /*
    * Global list of in-scope namespaces.
    */    
    ret->inScopeNamespaces = xsltPointerListCreate(-1);
    if (ret->inScopeNamespaces == NULL)
    goto internal_err;
    /*
    * Global list of excluded result ns-decls.
    */
    ret->exclResultNamespaces = xsltPointerListCreate(-1);
    if (ret->exclResultNamespaces == NULL)
    goto internal_err;
    /*
    * Global list of extension instruction namespace names.
    */    
    ret->extElemNamespaces = xsltPointerListCreate(-1);
    if (ret->extElemNamespaces == NULL)
    goto internal_err;

    return(ret);

internal_err:

    return(NULL);
}

#endif

xsltStylesheetPtr
xsltNewStylesheet(void) {
    xsltStylesheetPtr ret = NULL;    

    ret = (xsltStylesheetPtr) xmlMalloc(sizeof(xsltStylesheet));
    if (ret == NULL) {
    xsltTransformError(NULL, NULL, NULL,
        "xsltNewStylesheet : malloc failed\n");
    goto internal_err;
    }
    memset(ret, 0, sizeof(xsltStylesheet));

    ret->omitXmlDeclaration = -1;
    ret->standalone = -1;
    ret->decimalFormat = xsltNewDecimalFormat(NULL);
    ret->indent = -1;
    ret->errors = 0;
    ret->warnings = 0;
    ret->exclPrefixNr = 0;
    ret->exclPrefixMax = 0;
    ret->exclPrefixTab = NULL;
    ret->extInfos = NULL;
    ret->extrasNr = 0;
    ret->internalized = 1;
    ret->literal_result = 0;
    ret->dict = xmlDictCreate();
#ifdef WITH_XSLT_DEBUG
    xsltGenericDebug(xsltGenericDebugContext,
    "creating dictionary for stylesheet\n");
#endif

    xsltInit();

    return(ret);

internal_err:
    if (ret != NULL)
    xsltFreeStylesheet(ret);
    return(NULL);
}

int
xsltAllocateExtra(xsltStylesheetPtr style)
{
    return(style->extrasNr++);
}

int
xsltAllocateExtraCtxt(xsltTransformContextPtr ctxt)
{
    if (ctxt->extrasNr >= ctxt->extrasMax) {
    int i;
    if (ctxt->extrasNr == 0) {
        ctxt->extrasMax = 20;
        ctxt->extras = (xsltRuntimeExtraPtr)
        xmlMalloc(ctxt->extrasMax * sizeof(xsltRuntimeExtra));
        if (ctxt->extras == NULL) {
        xmlGenericError(xmlGenericErrorContext,
            "xsltAllocateExtraCtxt: out of memory\n");
        ctxt->state = XSLT_STATE_ERROR;
        return(0);
        }
        for (i = 0;i < ctxt->extrasMax;i++) {
        ctxt->extras[i].info = NULL;
        ctxt->extras[i].deallocate = NULL;
        ctxt->extras[i].val.ptr = NULL;
        }

    } else {
        xsltRuntimeExtraPtr tmp;

        ctxt->extrasMax += 100;
        tmp = (xsltRuntimeExtraPtr) xmlRealloc(ctxt->extras,
                    ctxt->extrasMax * sizeof(xsltRuntimeExtra));
        if (tmp == NULL) {
        xmlGenericError(xmlGenericErrorContext,
            "xsltAllocateExtraCtxt: out of memory\n");
        ctxt->state = XSLT_STATE_ERROR;
        return(0);
        }
        ctxt->extras = tmp;
        for (i = ctxt->extrasNr;i < ctxt->extrasMax;i++) {
        ctxt->extras[i].info = NULL;
        ctxt->extras[i].deallocate = NULL;
        ctxt->extras[i].val.ptr = NULL;
        }
    }
    }
    return(ctxt->extrasNr++);
}

static void
xsltFreeStylesheetList(xsltStylesheetPtr style) {
    xsltStylesheetPtr next;

    while (style != NULL) {
    next = style->next;
    xsltFreeStylesheet(style);
    style = next;
    }
}

static int
xsltCleanupStylesheetTree(xmlDocPtr doc ATTRIBUTE_UNUSED,
              xmlNodePtr rootElem ATTRIBUTE_UNUSED)
{    
#if 0 /* TODO: Currently disabled, since probably not needed. */
    xmlNodePtr cur;

    if ((doc == NULL) || (rootElem == NULL) ||
    (rootElem->type != XML_ELEMENT_NODE) ||
    (doc != rootElem->doc))
    return(-1);

    /*
    * Cleanup was suggested by Aleksey Sanin:
    * Clear the PSVI field to avoid problems if the
    * node-tree of the stylesheet is intended to be used for
    * further processing by the user (e.g. for compiling it
    * once again - although not recommended).
    */

    cur = rootElem;
    while (cur != NULL) {
    if (cur->type == XML_ELEMENT_NODE) {
        /*
        * Clear the PSVI field.
        */
        cur->psvi = NULL;
        if (cur->children) {
        cur = cur->children;
        continue;
        }
    }

leave_node:
    if (cur == rootElem)
        break;
    if (cur->next != NULL)
        cur = cur->next;
    else {
        cur = cur->parent;
        if (cur == NULL)
        break;
        goto leave_node;
    }
    }
#endif /* #if 0 */
    return(0);
}

void
xsltFreeStylesheet(xsltStylesheetPtr style)
{
    if (style == NULL)
        return;
    
#ifdef XSLT_REFACTORED
    /*
    * Start with a cleanup of the main stylesheet's doc.
    */
    if ((style->principal == style) && (style->doc))
    xsltCleanupStylesheetTree(style->doc,
        xmlDocGetRootElement(style->doc));
#ifdef XSLT_REFACTORED_XSLT_NSCOMP
    /*
    * Restore changed ns-decls before freeing the document.
    */
    if ((style->doc != NULL) &&
    XSLT_HAS_INTERNAL_NSMAP(style))
    {
    xsltRestoreDocumentNamespaces(XSLT_GET_INTERNAL_NSMAP(style),
        style->doc);    
    }
#endif /* XSLT_REFACTORED_XSLT_NSCOMP */
#else
    /*
    * Start with a cleanup of the main stylesheet's doc.
    */
    if ((style->parent == NULL) && (style->doc))
    xsltCleanupStylesheetTree(style->doc,
        xmlDocGetRootElement(style->doc));
#endif /* XSLT_REFACTORED */

    xsltFreeKeys(style);
    xsltFreeExts(style);
    xsltFreeTemplateHashes(style);
    xsltFreeDecimalFormatList(style);
    xsltFreeTemplateList(style->templates);
    xsltFreeAttributeSetsHashes(style);
    xsltFreeNamespaceAliasHashes(style);
    xsltFreeStylePreComps(style);
    /*
    * Free documents of all included stylsheet modules of this
    * stylesheet level.
    */
    xsltFreeStyleDocuments(style);
    /*
    * TODO: Best time to shutdown extension stuff?
    */
    xsltShutdownExts(style);
       
    if (style->variables != NULL)
        xsltFreeStackElemList(style->variables);
    if (style->cdataSection != NULL)
        xmlHashFree(style->cdataSection, NULL);
    if (style->stripSpaces != NULL)
        xmlHashFree(style->stripSpaces, NULL);
    if (style->nsHash != NULL)
        xmlHashFree(style->nsHash, NULL);
    if (style->exclPrefixTab != NULL)
        xmlFree(style->exclPrefixTab);
    if (style->method != NULL)
        xmlFree(style->method);
    if (style->methodURI != NULL)
        xmlFree(style->methodURI);
    if (style->version != NULL)
        xmlFree(style->version);
    if (style->encoding != NULL)
        xmlFree(style->encoding);
    if (style->doctypePublic != NULL)
        xmlFree(style->doctypePublic);
    if (style->doctypeSystem != NULL)
        xmlFree(style->doctypeSystem);
    if (style->mediaType != NULL)
        xmlFree(style->mediaType);
    if (style->attVTs)
        xsltFreeAVTList(style->attVTs);
    if (style->imports != NULL)
        xsltFreeStylesheetList(style->imports);

#ifdef XSLT_REFACTORED
    /*
    * If this is the principal stylesheet, then
    * free its internal data.
    */
    if (style->principal == style) {
    if (style->principalData) {
        xsltFreePrincipalStylesheetData(style->principalData);
        style->principalData = NULL;
    }
    }    
#endif
    /*
    * Better to free the main document of this stylesheet level
    * at the end - so here.
    */
    if (style->doc != NULL) {   
        xmlFreeDoc(style->doc);
    }

#ifdef WITH_XSLT_DEBUG
    xsltGenericDebug(xsltGenericDebugContext,
                     "freeing dictionary from stylesheet\n");
#endif
    xmlDictFree(style->dict);

    memset(style, -1, sizeof(xsltStylesheet));
    xmlFree(style);
}

/************************************************************************
 *                                  *
 *      Parsing of an XSLT Stylesheet               *
 *                                  *
 ************************************************************************/

#ifdef XSLT_REFACTORED
    /*
    * This is now performed in an optimized way in xsltParseXSLTTemplate.
    */
#else

static int
xsltGetInheritedNsList(xsltStylesheetPtr style,
                   xsltTemplatePtr template,
                   xmlNodePtr node)
{
    xmlNsPtr cur;
    xmlNsPtr *ret = NULL;
    int nbns = 0;
    int maxns = 10;
    int i;    

    if ((style == NULL) || (template == NULL) || (node == NULL) ||
    (template->inheritedNsNr != 0) || (template->inheritedNs != NULL))
    return(0);
    while (node != NULL) {
        if (node->type == XML_ELEMENT_NODE) {
            cur = node->nsDef;
            while (cur != NULL) {
        if (xmlStrEqual(cur->href, XSLT_NAMESPACE))
            goto skip_ns;

        if ((cur->prefix != NULL) &&
            (xsltCheckExtPrefix(style, cur->prefix)))
            goto skip_ns;
        /*
        * Check if this namespace was excluded.
        * Note that at this point only the exclusions defined
        * on the topmost stylesheet element are in the exclusion-list.
        */
        for (i = 0;i < style->exclPrefixNr;i++) {
            if (xmlStrEqual(cur->href, style->exclPrefixTab[i]))
            goto skip_ns;
        }
                if (ret == NULL) {
                    ret =
                        (xmlNsPtr *) xmlMalloc((maxns + 1) *
                                               sizeof(xmlNsPtr));
                    if (ret == NULL) {
                        xmlGenericError(xmlGenericErrorContext,
                                        "xsltGetInheritedNsList : out of memory!\n");
                        return(0);
                    }
                    ret[nbns] = NULL;
                }
        /*
        * Skip shadowed namespace bindings.
        */
                for (i = 0; i < nbns; i++) {
                    if ((cur->prefix == ret[i]->prefix) ||
                        (xmlStrEqual(cur->prefix, ret[i]->prefix)))
                        break;
                }
                if (i >= nbns) {
                    if (nbns >= maxns) {
                        maxns *= 2;
                        ret = (xmlNsPtr *) xmlRealloc(ret,
                                                      (maxns +
                                                       1) *
                                                      sizeof(xmlNsPtr));
                        if (ret == NULL) {
                            xmlGenericError(xmlGenericErrorContext,
                                            "xsltGetInheritedNsList : realloc failed!\n");
                            return(0);
                        }
                    }
                    ret[nbns++] = cur;
                    ret[nbns] = NULL;
                }
skip_ns:
                cur = cur->next;
            }
        }
        node = node->parent;
    }
    if (nbns != 0) {
#ifdef WITH_XSLT_DEBUG_PARSING
        xsltGenericDebug(xsltGenericDebugContext,
                         "template has %d inherited namespaces\n", nbns);
#endif
    template->inheritedNsNr = nbns;
    template->inheritedNs = ret;
    }
    return (nbns);
}
#endif /* else of XSLT_REFACTORED */

void
xsltParseStylesheetOutput(xsltStylesheetPtr style, xmlNodePtr cur)
{
    xmlChar *elements,
     *prop;
    xmlChar *element,
     *end;

    if ((cur == NULL) || (style == NULL))
        return;
   
    prop = xmlGetNsProp(cur, (const xmlChar *) "version", NULL);
    if (prop != NULL) {
        if (style->version != NULL)
            xmlFree(style->version);
        style->version = prop;
    }

    prop = xmlGetNsProp(cur, (const xmlChar *) "encoding", NULL);
    if (prop != NULL) {
        if (style->encoding != NULL)
            xmlFree(style->encoding);
        style->encoding = prop;
    }

    /* relaxed to support xt:document
    * TODO KB: What does "relaxed to support xt:document" mean?
    */
    prop = xmlGetNsProp(cur, (const xmlChar *) "method", NULL);
    if (prop != NULL) {
        const xmlChar *URI;

        if (style->method != NULL)
            xmlFree(style->method);
        style->method = NULL;
        if (style->methodURI != NULL)
            xmlFree(style->methodURI);
        style->methodURI = NULL;

    /*
    * TODO: Don't use xsltGetQNameURI().
    */
    URI = xsltGetQNameURI(cur, &prop);
    if (prop == NULL) {
        if (style != NULL) style->errors++;
    } else if (URI == NULL) {
            if ((xmlStrEqual(prop, (const xmlChar *) "xml")) ||
                (xmlStrEqual(prop, (const xmlChar *) "html")) ||
                (xmlStrEqual(prop, (const xmlChar *) "text"))) {
                style->method = prop;
            } else {
        xsltTransformError(NULL, style, cur,
                                 "invalid value for method: %s\n", prop);
                if (style != NULL) style->warnings++;
            }
    } else {
        style->method = prop;
        style->methodURI = xmlStrdup(URI);
    }
    }

    prop = xmlGetNsProp(cur, (const xmlChar *) "doctype-system", NULL);
    if (prop != NULL) {
        if (style->doctypeSystem != NULL)
            xmlFree(style->doctypeSystem);
        style->doctypeSystem = prop;
    }

    prop = xmlGetNsProp(cur, (const xmlChar *) "doctype-public", NULL);
    if (prop != NULL) {
        if (style->doctypePublic != NULL)
            xmlFree(style->doctypePublic);
        style->doctypePublic = prop;
    }

    prop = xmlGetNsProp(cur, (const xmlChar *) "standalone", NULL);
    if (prop != NULL) {
        if (xmlStrEqual(prop, (const xmlChar *) "yes")) {
            style->standalone = 1;
        } else if (xmlStrEqual(prop, (const xmlChar *) "no")) {
            style->standalone = 0;
        } else {
        xsltTransformError(NULL, style, cur,
                             "invalid value for standalone: %s\n", prop);
            style->errors++;
        }
        xmlFree(prop);
    }

    prop = xmlGetNsProp(cur, (const xmlChar *) "indent", NULL);
    if (prop != NULL) {
        if (xmlStrEqual(prop, (const xmlChar *) "yes")) {
            style->indent = 1;
        } else if (xmlStrEqual(prop, (const xmlChar *) "no")) {
            style->indent = 0;
        } else {
        xsltTransformError(NULL, style, cur,
                             "invalid value for indent: %s\n", prop);
            style->errors++;
        }
        xmlFree(prop);
    }

    prop = xmlGetNsProp(cur, (const xmlChar *) "omit-xml-declaration", NULL);
    if (prop != NULL) {
        if (xmlStrEqual(prop, (const xmlChar *) "yes")) {
            style->omitXmlDeclaration = 1;
        } else if (xmlStrEqual(prop, (const xmlChar *) "no")) {
            style->omitXmlDeclaration = 0;
        } else {
        xsltTransformError(NULL, style, cur,
                             "invalid value for omit-xml-declaration: %s\n",
                             prop);
            style->errors++;
        }
        xmlFree(prop);
    }

    elements = xmlGetNsProp(cur, (const xmlChar *) "cdata-section-elements",
    NULL);
    if (elements != NULL) {
        if (style->cdataSection == NULL)
            style->cdataSection = xmlHashCreate(10);
        if (style->cdataSection == NULL)
            return;

        element = elements;
        while (*element != 0) {
            while (IS_BLANK(*element))
                element++;
            if (*element == 0)
                break;
            end = element;
            while ((*end != 0) && (!IS_BLANK(*end)))
                end++;
            element = xmlStrndup(element, end - element);
            if (element) {      
#ifdef WITH_XSLT_DEBUG_PARSING
                xsltGenericDebug(xsltGenericDebugContext,
                                 "add cdata section output element %s\n",
                                 element);
#endif
        if (xmlValidateQName(BAD_CAST element, 0) != 0) {
            xsltTransformError(NULL, style, cur,
            "Attribute 'cdata-section-elements': The value "
            "'%s' is not a valid QName.\n", element);
            xmlFree(element);
            style->errors++;
        } else {
            const xmlChar *URI;

            /*
            * TODO: Don't use xsltGetQNameURI().
            */
            URI = xsltGetQNameURI(cur, &element);
            if (element == NULL) {
            /*
            * TODO: We'll report additionally an error
            *  via the stylesheet's error handling.         
            */
            xsltTransformError(NULL, style, cur,
                "Attribute 'cdata-section-elements': The value "
                "'%s' is not a valid QName.\n", element);
            style->errors++;
            } else {
            xmlNsPtr ns;
            
            /*
            * XSLT-1.0 "Each QName is expanded into an
            *  expanded-name using the namespace declarations in
            *  effect on the xsl:output element in which the QName
            *  occurs; if there is a default namespace, it is used
            *  for QNames that do not have a prefix"
            * NOTE: Fix of bug #339570.
            */
            if (URI == NULL) {
                ns = xmlSearchNs(style->doc, cur, NULL);
                if (ns != NULL)
                URI = ns->href;
            }          
            xmlHashAddEntry2(style->cdataSection, element, URI,
                (void *) "cdata");
            xmlFree(element);
            }
        }
            }
            element = end;
        }
        xmlFree(elements);
    }

    prop = xmlGetNsProp(cur, (const xmlChar *) "media-type", NULL);
    if (prop != NULL) {
    if (style->mediaType)
        xmlFree(style->mediaType);
    style->mediaType = prop;
    }
    if (cur->children != NULL) {
    xsltParseContentError(style, cur->children);
    }
}

static void
xsltParseStylesheetDecimalFormat(xsltStylesheetPtr style, xmlNodePtr cur)
{
    xmlChar *prop;
    xsltDecimalFormatPtr format;
    xsltDecimalFormatPtr iter;
    
    if ((cur == NULL) || (style == NULL))
    return;

    format = style->decimalFormat;
    
    prop = xmlGetNsProp(cur, BAD_CAST("name"), NULL);
    if (prop != NULL) {
    format = xsltDecimalFormatGetByName(style, prop);
    if (format != NULL) {
        xsltTransformError(NULL, style, cur,
     "xsltParseStylestyleDecimalFormat: %s already exists\n", prop);
        if (style != NULL) style->warnings++;
        return;
    }
    format = xsltNewDecimalFormat(prop);
    if (format == NULL) {
        xsltTransformError(NULL, style, cur,
     "xsltParseStylestyleDecimalFormat: failed creating new decimal-format\n");
        if (style != NULL) style->errors++;
        return;
    }
    /* Append new decimal-format structure */
    for (iter = style->decimalFormat; iter->next; iter = iter->next)
        ;
    if (iter)
        iter->next = format;
    }

    prop = xmlGetNsProp(cur, (const xmlChar *)"decimal-separator", NULL);
    if (prop != NULL) {
    if (format->decimalPoint != NULL) xmlFree(format->decimalPoint);
    format->decimalPoint  = prop;
    }
    
    prop = xmlGetNsProp(cur, (const xmlChar *)"grouping-separator", NULL);
    if (prop != NULL) {
    if (format->grouping != NULL) xmlFree(format->grouping);
    format->grouping  = prop;
    }

    prop = xmlGetNsProp(cur, (const xmlChar *)"infinity", NULL);
    if (prop != NULL) {
    if (format->infinity != NULL) xmlFree(format->infinity);
    format->infinity  = prop;
    }
    
    prop = xmlGetNsProp(cur, (const xmlChar *)"minus-sign", NULL);
    if (prop != NULL) {
    if (format->minusSign != NULL) xmlFree(format->minusSign);
    format->minusSign  = prop;
    }
    
    prop = xmlGetNsProp(cur, (const xmlChar *)"NaN", NULL);
    if (prop != NULL) {
    if (format->noNumber != NULL) xmlFree(format->noNumber);
    format->noNumber  = prop;
    }
    
    prop = xmlGetNsProp(cur, (const xmlChar *)"percent", NULL);
    if (prop != NULL) {
    if (format->percent != NULL) xmlFree(format->percent);
    format->percent  = prop;
    }
    
    prop = xmlGetNsProp(cur, (const xmlChar *)"per-mille", NULL);
    if (prop != NULL) {
    if (format->permille != NULL) xmlFree(format->permille);
    format->permille  = prop;
    }
    
    prop = xmlGetNsProp(cur, (const xmlChar *)"zero-digit", NULL);
    if (prop != NULL) {
    if (format->zeroDigit != NULL) xmlFree(format->zeroDigit);
    format->zeroDigit  = prop;
    }
    
    prop = xmlGetNsProp(cur, (const xmlChar *)"digit", NULL);
    if (prop != NULL) {
    if (format->digit != NULL) xmlFree(format->digit);
    format->digit  = prop;
    }
    
    prop = xmlGetNsProp(cur, (const xmlChar *)"pattern-separator", NULL);
    if (prop != NULL) {
    if (format->patternSeparator != NULL) xmlFree(format->patternSeparator);
    format->patternSeparator  = prop;
    }
    if (cur->children != NULL) {
    xsltParseContentError(style, cur->children);
    }
}

static void
xsltParseStylesheetPreserveSpace(xsltStylesheetPtr style, xmlNodePtr cur) {
    xmlChar *elements;
    xmlChar *element, *end;

    if ((cur == NULL) || (style == NULL))
    return;

    elements = xmlGetNsProp(cur, (const xmlChar *)"elements", NULL);
    if (elements == NULL) {
    xsltTransformError(NULL, style, cur,
        "xsltParseStylesheetPreserveSpace: missing elements attribute\n");
    if (style != NULL) style->warnings++;
    return;
    }

    if (style->stripSpaces == NULL)
    style->stripSpaces = xmlHashCreate(10);
    if (style->stripSpaces == NULL)
    return;

    element = elements;
    while (*element != 0) {
    while (IS_BLANK(*element)) element++;
    if (*element == 0)
        break;
        end = element;
    while ((*end != 0) && (!IS_BLANK(*end))) end++;
    element = xmlStrndup(element, end - element);
    if (element) {
#ifdef WITH_XSLT_DEBUG_PARSING
        xsltGenericDebug(xsltGenericDebugContext,
        "add preserved space element %s\n", element);
#endif
        if (xmlStrEqual(element, (const xmlChar *)"*")) {
        style->stripAll = -1;
        } else {
        const xmlChar *URI;

        /*
        * TODO: Don't use xsltGetQNameURI().
        */
                URI = xsltGetQNameURI(cur, &element);

        xmlHashAddEntry2(style->stripSpaces, element, URI,
                (xmlChar *) "preserve");
        }
        xmlFree(element);
    }
    element = end;
    }
    xmlFree(elements);
    if (cur->children != NULL) {
    xsltParseContentError(style, cur->children);
    }
}

#ifdef XSLT_REFACTORED
#else

static void
xsltParseStylesheetExtPrefix(xsltStylesheetPtr style, xmlNodePtr cur,
                 int isXsltElem) {
    xmlChar *prefixes;
    xmlChar *prefix, *end;

    if ((cur == NULL) || (style == NULL))
    return;

    if (isXsltElem) {
    /* For xsl:stylesheet/xsl:transform. */
    prefixes = xmlGetNsProp(cur,
        (const xmlChar *)"extension-element-prefixes", NULL);
    } else {
    /* For literal result elements and extension instructions. */
    prefixes = xmlGetNsProp(cur,
        (const xmlChar *)"extension-element-prefixes", XSLT_NAMESPACE);
    }
    if (prefixes == NULL) {
    return;
    }

    prefix = prefixes;
    while (*prefix != 0) {
    while (IS_BLANK(*prefix)) prefix++;
    if (*prefix == 0)
        break;
        end = prefix;
    while ((*end != 0) && (!IS_BLANK(*end))) end++;
    prefix = xmlStrndup(prefix, end - prefix);
    if (prefix) {
        xmlNsPtr ns;

        if (xmlStrEqual(prefix, (const xmlChar *)"#default"))
        ns = xmlSearchNs(style->doc, cur, NULL);
        else
        ns = xmlSearchNs(style->doc, cur, prefix);
        if (ns == NULL) {
        xsltTransformError(NULL, style, cur,
        "xsl:extension-element-prefix : undefined namespace %s\n",
                             prefix);
        if (style != NULL) style->warnings++;
        } else {
#ifdef WITH_XSLT_DEBUG_PARSING
        xsltGenericDebug(xsltGenericDebugContext,
            "add extension prefix %s\n", prefix);
#endif
        xsltRegisterExtPrefix(style, prefix, ns->href);
        }
        xmlFree(prefix);
    }
    prefix = end;
    }
    xmlFree(prefixes);
}
#endif /* else of XSLT_REFACTORED */

static void
xsltParseStylesheetStripSpace(xsltStylesheetPtr style, xmlNodePtr cur) {
    xmlChar *elements;
    xmlChar *element, *end;

    if ((cur == NULL) || (style == NULL))
    return;

    elements = xmlGetNsProp(cur, (const xmlChar *)"elements", NULL);
    if (elements == NULL) {
    xsltTransformError(NULL, style, cur,
        "xsltParseStylesheetStripSpace: missing elements attribute\n");
    if (style != NULL) style->warnings++;
    return;
    }

    if (style->stripSpaces == NULL)
    style->stripSpaces = xmlHashCreate(10);
    if (style->stripSpaces == NULL)
    return;

    element = elements;
    while (*element != 0) {
    while (IS_BLANK(*element)) element++;
    if (*element == 0)
        break;
        end = element;
    while ((*end != 0) && (!IS_BLANK(*end))) end++;
    element = xmlStrndup(element, end - element);
    if (element) {
#ifdef WITH_XSLT_DEBUG_PARSING
        xsltGenericDebug(xsltGenericDebugContext,
        "add stripped space element %s\n", element);
#endif
        if (xmlStrEqual(element, (const xmlChar *)"*")) {
        style->stripAll = 1;
        } else {
        const xmlChar *URI;

        /*
        * TODO: Don't use xsltGetQNameURI().
        */
                URI = xsltGetQNameURI(cur, &element);

        xmlHashAddEntry2(style->stripSpaces, element, URI,
                    (xmlChar *) "strip");
        }
        xmlFree(element);
    }
    element = end;
    }
    xmlFree(elements);
    if (cur->children != NULL) {
    xsltParseContentError(style, cur->children);
    }
}

#ifdef XSLT_REFACTORED
#else

static int
xsltParseStylesheetExcludePrefix(xsltStylesheetPtr style, xmlNodePtr cur,
                 int isXsltElem)
{
    int nb = 0;
    xmlChar *prefixes;
    xmlChar *prefix, *end;

    if ((cur == NULL) || (style == NULL))
    return(0);

    if (isXsltElem)
    prefixes = xmlGetNsProp(cur,
        (const xmlChar *)"exclude-result-prefixes", NULL);
    else
    prefixes = xmlGetNsProp(cur,
        (const xmlChar *)"exclude-result-prefixes", XSLT_NAMESPACE);

    if (prefixes == NULL) {
    return(0);
    }

    prefix = prefixes;
    while (*prefix != 0) {
    while (IS_BLANK(*prefix)) prefix++;
    if (*prefix == 0)
        break;
        end = prefix;
    while ((*end != 0) && (!IS_BLANK(*end))) end++;
    prefix = xmlStrndup(prefix, end - prefix);
    if (prefix) {
        xmlNsPtr ns;

        if (xmlStrEqual(prefix, (const xmlChar *)"#default"))
        ns = xmlSearchNs(style->doc, cur, NULL);
        else
        ns = xmlSearchNs(style->doc, cur, prefix);
        if (ns == NULL) {
        xsltTransformError(NULL, style, cur,
        "xsl:exclude-result-prefixes : undefined namespace %s\n",
                             prefix);
        if (style != NULL) style->warnings++;
        } else {
        if (exclPrefixPush(style, (xmlChar *) ns->href) >= 0) {
#ifdef WITH_XSLT_DEBUG_PARSING
            xsltGenericDebug(xsltGenericDebugContext,
            "exclude result prefix %s\n", prefix);
#endif
            nb++;
        }
        }
        xmlFree(prefix);
    }
    prefix = end;
    }
    xmlFree(prefixes);
    return(nb);
}
#endif /* else of XSLT_REFACTORED */

#ifdef XSLT_REFACTORED

/*
* xsltTreeEnsureXMLDecl:
* @doc: the doc
* 
* BIG NOTE:
*  This was copy&pasted from Libxml2's xmlTreeEnsureXMLDecl() in "tree.c".
* Ensures that there is an XML namespace declaration on the doc.
* 
* Returns the XML ns-struct or NULL on API and internal errors.
*/
static xmlNsPtr
xsltTreeEnsureXMLDecl(xmlDocPtr doc)
{
    if (doc == NULL)
    return (NULL);
    if (doc->oldNs != NULL)
    return (doc->oldNs);
    {
    xmlNsPtr ns;
    ns = (xmlNsPtr) xmlMalloc(sizeof(xmlNs));
    if (ns == NULL) {
        xmlGenericError(xmlGenericErrorContext,
        "xsltTreeEnsureXMLDecl: Failed to allocate "
        "the XML namespace.\n");    
        return (NULL);
    }
    memset(ns, 0, sizeof(xmlNs));
    ns->type = XML_LOCAL_NAMESPACE;
    /*
    * URGENT TODO: revisit this.
    */
#ifdef LIBXML_NAMESPACE_DICT
    if (doc->dict)
        ns->href = xmlDictLookup(doc->dict, XML_XML_NAMESPACE, -1);
    else
        ns->href = xmlStrdup(XML_XML_NAMESPACE);
#else
    ns->href = xmlStrdup(XML_XML_NAMESPACE); 
#endif
    ns->prefix = xmlStrdup((const xmlChar *)"xml");
    doc->oldNs = ns;
    return (ns);
    }
}

/*
* xsltTreeAcquireStoredNs:
* @doc: the doc
* @nsName: the namespace name
* @prefix: the prefix
* 
* BIG NOTE:
*  This was copy&pasted from Libxml2's xmlDOMWrapStoreNs() in "tree.c".
* Creates or reuses an xmlNs struct on doc->oldNs with
* the given prefix and namespace name.
* 
* Returns the aquired ns struct or NULL in case of an API
*         or internal error.
*/
static xmlNsPtr
xsltTreeAcquireStoredNs(xmlDocPtr doc,
            const xmlChar *nsName,
            const xmlChar *prefix)
{
    xmlNsPtr ns;

    if (doc == NULL)
    return (NULL);
    if (doc->oldNs != NULL)
    ns = doc->oldNs;
    else
    ns = xsltTreeEnsureXMLDecl(doc);
    if (ns == NULL)
    return (NULL);
    if (ns->next != NULL) {
    /* Reuse. */
    ns = ns->next;
    while (ns != NULL) {
        if ((ns->prefix == NULL) != (prefix == NULL)) {
        /* NOP */
        } else if (prefix == NULL) {
        if (xmlStrEqual(ns->href, nsName))
            return (ns);
        } else {
        if ((ns->prefix[0] == prefix[0]) &&
             xmlStrEqual(ns->prefix, prefix) &&
             xmlStrEqual(ns->href, nsName))
            return (ns);
        
        }
        if (ns->next == NULL)
        break;
        ns = ns->next;
    }
    }
    /* Create. */
    ns->next = xmlNewNs(NULL, nsName, prefix);
    return (ns->next);
}

static int
xsltLREBuildEffectiveNs(xsltCompilerCtxtPtr cctxt,
            xmlNodePtr elem)
{
    xmlNsPtr ns;
    xsltNsAliasPtr alias;

    if ((cctxt == NULL) || (elem == NULL))
    return(-1);
    if ((cctxt->nsAliases == NULL) || (! cctxt->hasNsAliases))
    return(0);

    alias = cctxt->nsAliases;           
    while (alias != NULL) {
    if ( /* If both namespaces are NULL... */
        ( (elem->ns == NULL) &&
        ((alias->literalNs == NULL) ||
        (alias->literalNs->href == NULL)) ) ||
        /* ... or both namespace are equal */
        ( (elem->ns != NULL) &&
        (alias->literalNs != NULL) &&
        xmlStrEqual(elem->ns->href, alias->literalNs->href) ) )
    {
        if ((alias->targetNs != NULL) &&
        (alias->targetNs->href != NULL))
        {
        /*
        * Convert namespace.
        */
        if (elem->doc == alias->docOfTargetNs) {
            /*
            * This is the nice case: same docs.
            * This will eventually assign a ns-decl which
            * is shadowed, but this has no negative effect on
            * the generation of the result tree.
            */
            elem->ns = alias->targetNs;
        } else {
            /*
            * This target xmlNs originates from a different
            * stylesheet tree. Try to locate it in the
            * in-scope namespaces.
            * OPTIMIZE TODO: Use the compiler-node-info inScopeNs.
            */
            ns = xmlSearchNs(elem->doc, elem,
            alias->targetNs->prefix);           
            /*
            * If no matching ns-decl found, then assign a
            * ns-decl stored in xmlDoc.
            */
            if ((ns == NULL) ||
            (! xmlStrEqual(ns->href, alias->targetNs->href)))
            {
            /*
            * BIG NOTE: The use of xsltTreeAcquireStoredNs()
            *  is not very efficient, but currently I don't
            *  see an other way of *safely* changing a node's
            *  namespace, since the xmlNs struct in
            *  alias->targetNs might come from an other
            *  stylesheet tree. So we need to anchor it in the
            *  current document, without adding it to the tree,
            *  which would otherwise change the in-scope-ns
            *  semantic of the tree.
            */
            ns = xsltTreeAcquireStoredNs(elem->doc,
                alias->targetNs->href,
                alias->targetNs->prefix);
            
            if (ns == NULL) {
                xsltTransformError(NULL, cctxt->style, elem,
                "Internal error in "
                "xsltLREBuildEffectiveNs(): "
                "failed to acquire a stored "
                "ns-declaration.\n");
                cctxt->style->errors++;
                return(-1);
                
            }
            }
            elem->ns = ns;
        }          
        } else {
        /*
        * Move into or leave in the NULL namespace.
        */
        elem->ns = NULL;
        }
        break;
    }
    alias = alias->next;
    }
    /*
    * Same with attributes of literal result elements.
    */
    if (elem->properties != NULL) {
    xmlAttrPtr attr = elem->properties;
    
    while (attr != NULL) {
        if (attr->ns == NULL) {
        attr = attr->next;
        continue;
        }
        alias = cctxt->nsAliases;
        while (alias != NULL) {
        if ( /* If both namespaces are NULL... */
            ( (elem->ns == NULL) &&
            ((alias->literalNs == NULL) ||
            (alias->literalNs->href == NULL)) ) ||
            /* ... or both namespace are equal */
            ( (elem->ns != NULL) &&
            (alias->literalNs != NULL) &&
            xmlStrEqual(elem->ns->href, alias->literalNs->href) ) )
        {
            if ((alias->targetNs != NULL) &&
            (alias->targetNs->href != NULL))
            {           
            if (elem->doc == alias->docOfTargetNs) {
                elem->ns = alias->targetNs;
            } else {
                ns = xmlSearchNs(elem->doc, elem,
                alias->targetNs->prefix);
                if ((ns == NULL) ||
                (! xmlStrEqual(ns->href, alias->targetNs->href)))
                {
                ns = xsltTreeAcquireStoredNs(elem->doc,
                    alias->targetNs->href,
                    alias->targetNs->prefix);
                
                if (ns == NULL) {
                    xsltTransformError(NULL, cctxt->style, elem,
                    "Internal error in "
                    "xsltLREBuildEffectiveNs(): "
                    "failed to acquire a stored "
                    "ns-declaration.\n");
                    cctxt->style->errors++;
                    return(-1);
                    
                }
                }
                elem->ns = ns;
            }
            } else {
            /*
            * Move into or leave in the NULL namespace.
            */
            elem->ns = NULL;
            }
            break;
        }
        alias = alias->next;
        }
        
        attr = attr->next;
    }
    }
    return(0);
}

static int
xsltLREBuildEffectiveNsNodes(xsltCompilerCtxtPtr cctxt,
                 xsltStyleItemLRElementInfoPtr item,
                 xmlNodePtr elem,
                 int isLRE)
{
    xmlNsPtr ns, tmpns;
    xsltEffectiveNsPtr effNs, lastEffNs = NULL;
    int i, j, holdByElem;
    xsltPointerListPtr extElemNs = cctxt->inode->extElemNs;
    xsltPointerListPtr exclResultNs = cctxt->inode->exclResultNs;

    if ((cctxt == NULL) || (cctxt->inode == NULL) || (elem == NULL) ||
    (item == NULL) || (item->effectiveNs != NULL))
    return(-1);

    if (item->inScopeNs == NULL)    
    return(0);

    extElemNs = cctxt->inode->extElemNs;
    exclResultNs = cctxt->inode->exclResultNs;

    for (i = 0; i < item->inScopeNs->totalNumber; i++) {
    ns = item->inScopeNs->list[i];
    /*
    * Skip namespaces designated as excluded namespaces
    * -------------------------------------------------
    *
    * XSLT-20 TODO: In XSLT 2.0 we need to keep namespaces
    *  which are target namespaces of namespace-aliases
    *  regardless if designated as excluded.
    *
    * Exclude the XSLT namespace.
    */
    if (xmlStrEqual(ns->href, XSLT_NAMESPACE))
        goto skip_ns;

    /*
    * Apply namespace aliasing
    * ------------------------
    *
    * SPEC XSLT 2.0
    *  "- A namespace node whose string value is a literal namespace
    *     URI is not copied to the result tree.
    *   - A namespace node whose string value is a target namespace URI
    *     is copied to the result tree, whether or not the URI
    *     identifies an excluded namespace."
    * 
    * NOTE: The ns-aliasing machanism is non-cascading.
    *  (checked with Saxon, Xalan and MSXML .NET).
    * URGENT TODO: is style->nsAliases the effective list of
    *  ns-aliases, or do we need to lookup the whole
    *  import-tree?
    * TODO: Get rid of import-tree lookup.
    */
    if (cctxt->hasNsAliases) {
        xsltNsAliasPtr alias;
        /*
        * First check for being a target namespace.
        */
        alias = cctxt->nsAliases;
        do {
        /*
        * TODO: Is xmlns="" handled already?
        */
        if ((alias->targetNs != NULL) &&
            (xmlStrEqual(alias->targetNs->href, ns->href)))
        {
            /*
            * Recognized as a target namespace; use it regardless
            * if excluded otherwise.
            */
            goto add_effective_ns;
        }
        alias = alias->next;
        } while (alias != NULL);

        alias = cctxt->nsAliases;
        do {
        /*
        * TODO: Is xmlns="" handled already?
        */
        if ((alias->literalNs != NULL) &&
            (xmlStrEqual(alias->literalNs->href, ns->href)))
        {
            /*
            * Recognized as an namespace alias; do not use it.
            */
            goto skip_ns;
        }
        alias = alias->next;
        } while (alias != NULL);
    }
    
    /*
    * Exclude excluded result namespaces.
    */
    if (exclResultNs) {
        for (j = 0; j < exclResultNs->number; j++)
        if (xmlStrEqual(ns->href, BAD_CAST exclResultNs->items[j]))
            goto skip_ns;
    }
    /*
    * Exclude extension-element namespaces.
    */
    if (extElemNs) {
        for (j = 0; j < extElemNs->number; j++)
        if (xmlStrEqual(ns->href, BAD_CAST extElemNs->items[j]))
            goto skip_ns;
    }

add_effective_ns:
    /*
    * OPTIMIZE TODO: This information may not be needed.
    */
    if (isLRE && (elem->nsDef != NULL)) {
        holdByElem = 0;
        tmpns = elem->nsDef;
        do {
        if (tmpns == ns) {
            holdByElem = 1;
            break;
        }
        tmpns = tmpns->next;
        } while (tmpns != NULL);        
    } else
        holdByElem = 0;
    
    
    /*
    * Add the effective namespace declaration.
    */
    effNs = (xsltEffectiveNsPtr) xmlMalloc(sizeof(xsltEffectiveNs));
    if (effNs == NULL) {
        xsltTransformError(NULL, cctxt->style, elem,
        "Internal error in xsltLREBuildEffectiveNs(): "
        "failed to allocate memory.\n");
        cctxt->style->errors++;
        return(-1);
    }
    if (cctxt->psData->effectiveNs == NULL) {
        cctxt->psData->effectiveNs = effNs;
        effNs->nextInStore = NULL;   
    } else {
        effNs->nextInStore = cctxt->psData->effectiveNs;
        cctxt->psData->effectiveNs = effNs;
    }

    effNs->next = NULL;
    effNs->prefix = ns->prefix;
    effNs->nsName = ns->href;
    effNs->holdByElem = holdByElem;
    
    if (lastEffNs == NULL)
        item->effectiveNs = effNs;
    else
        lastEffNs->next = effNs;
    lastEffNs = effNs;
    
skip_ns:
    {}
    }
    return(0);
}


static int
xsltLREInfoCreate(xsltCompilerCtxtPtr cctxt,
          xmlNodePtr elem,
          int isLRE)
{
    xsltStyleItemLRElementInfoPtr item;

    if ((cctxt == NULL) || (cctxt->inode == NULL))
    return(-1);

    item = (xsltStyleItemLRElementInfoPtr)
    xmlMalloc(sizeof(xsltStyleItemLRElementInfo));
    if (item == NULL) {
    xsltTransformError(NULL, cctxt->style, NULL,
        "Internal error in xsltLREInfoCreate(): "
        "memory allocation failed.\n");
    cctxt->style->errors++;
    return(-1);
    }
    memset(item, 0, sizeof(xsltStyleItemLRElementInfo));
    item->type = XSLT_FUNC_LITERAL_RESULT_ELEMENT;
    /*
    * Store it in the stylesheet.
    */
    item->next = cctxt->style->preComps;
    cctxt->style->preComps = (xsltElemPreCompPtr) item;
    /*
    * @inScopeNs are used for execution of XPath expressions
    *  in AVTs.
    */
    item->inScopeNs = cctxt->inode->inScopeNs;
    
    if (elem)
    xsltLREBuildEffectiveNsNodes(cctxt, item, elem, isLRE);

    cctxt->inode->litResElemInfo = item;
    cctxt->inode->nsChanged = 0;
    cctxt->maxLREs++;
    return(0);
}

static xsltVarInfoPtr
xsltCompilerVarInfoPush(xsltCompilerCtxtPtr cctxt,
                  xmlNodePtr inst,
                  const xmlChar *name,
                  const xmlChar *nsName)
{
    xsltVarInfoPtr ivar;

    if ((cctxt->ivar != NULL) && (cctxt->ivar->next != NULL)) {
    ivar = cctxt->ivar->next;
    } else if ((cctxt->ivar == NULL) && (cctxt->ivars != NULL)) {
    ivar = cctxt->ivars;
    } else {
    ivar = (xsltVarInfoPtr) xmlMalloc(sizeof(xsltVarInfo));
    if (ivar == NULL) {
        xsltTransformError(NULL, cctxt->style, inst,
        "xsltParseInScopeVarPush: xmlMalloc() failed!\n");
        cctxt->style->errors++;
        return(NULL);
    }
    /* memset(retVar, 0, sizeof(xsltInScopeVar)); */
    if (cctxt->ivars == NULL) {
        cctxt->ivars = ivar;
        ivar->prev = NULL;
    } else {
        cctxt->ivar->next = ivar;
        ivar->prev = cctxt->ivar;
    }
    cctxt->ivar = ivar;
    ivar->next = NULL;
    }
    ivar->depth = cctxt->depth;
    ivar->name = name;
    ivar->nsName = nsName;
    return(ivar);
}

static void
xsltCompilerVarInfoPop(xsltCompilerCtxtPtr cctxt)
{

    while ((cctxt->ivar != NULL) &&
    (cctxt->ivar->depth > cctxt->depth))
    {
    cctxt->ivar = cctxt->ivar->prev;
    }
}

/*
* xsltCompilerNodePush:
*
* @cctxt: the compilation context
* @node: the node to be pushed (this can also be the doc-node)
*
* 
*
* Returns the current node info structure or
*         NULL in case of an internal error.
*/
static xsltCompilerNodeInfoPtr
xsltCompilerNodePush(xsltCompilerCtxtPtr cctxt, xmlNodePtr node)
{    
    xsltCompilerNodeInfoPtr inode, iprev;

    if ((cctxt->inode != NULL) && (cctxt->inode->next != NULL)) {   
    inode = cctxt->inode->next;
    } else if ((cctxt->inode == NULL) && (cctxt->inodeList != NULL)) {
    inode = cctxt->inodeList;   
    } else {
    /*
    * Create a new node-info.
    */
    inode = (xsltCompilerNodeInfoPtr)
        xmlMalloc(sizeof(xsltCompilerNodeInfo));
    if (inode == NULL) {
        xsltTransformError(NULL, cctxt->style, NULL,
        "xsltCompilerNodePush: malloc failed.\n");
        return(NULL);
    }
    memset(inode, 0, sizeof(xsltCompilerNodeInfo));
    if (cctxt->inodeList == NULL)
        cctxt->inodeList = inode;
    else {
        cctxt->inodeLast->next = inode;
        inode->prev = cctxt->inodeLast;
    }
    cctxt->inodeLast = inode;
    cctxt->maxNodeInfos++;  
    if (cctxt->inode == NULL) {
        cctxt->inode = inode;
        /*
        * Create an initial literal result element info for
        * the root of the stylesheet.
        */
        xsltLREInfoCreate(cctxt, NULL, 0);
    } 
    }       
    cctxt->depth++;
    cctxt->inode = inode;
    /*
    * REVISIT TODO: Keep the reset always complete.    
    * NOTE: Be carefull with the @node, since it might be
    *  a doc-node.
    */
    inode->node = node;
    inode->depth = cctxt->depth;
    inode->templ = NULL;
    inode->category = XSLT_ELEMENT_CATEGORY_XSLT;
    inode->type = 0;
    inode->item = NULL;
    inode->curChildType = 0;
    inode->extContentHandled = 0;
    inode->isRoot = 0;
    
    if (inode->prev != NULL) {
    iprev = inode->prev;
    /*
    * Inherit the following information:
    * ---------------------------------
    *
    * In-scope namespaces
    */
    inode->inScopeNs = iprev->inScopeNs;
    /*
    * Info for literal result elements
    */
    inode->litResElemInfo = iprev->litResElemInfo;
    inode->nsChanged = iprev->nsChanged;
    /*
    * Excluded result namespaces
    */
    inode->exclResultNs = iprev->exclResultNs;
    /*
    * Extension instruction namespaces
    */
    inode->extElemNs = iprev->extElemNs;
    /*
    * Whitespace preservation
    */
    inode->preserveWhitespace = iprev->preserveWhitespace;
    /*
    * Forwards-compatible mode
    */
    inode->forwardsCompat = iprev->forwardsCompat;  
    } else {
    inode->inScopeNs = NULL;
    inode->exclResultNs = NULL;
    inode->extElemNs = NULL;
    inode->preserveWhitespace = 0;
    inode->forwardsCompat = 0;
    }
    
    return(inode);
}

/*
* xsltCompilerNodePop:
*
* @cctxt: the compilation context
* @node: the node to be pushed (this can also be the doc-node)
*
* Pops the current node info.
*/
static void
xsltCompilerNodePop(xsltCompilerCtxtPtr cctxt, xmlNodePtr node)
{    
    if (cctxt->inode == NULL) {
    xmlGenericError(xmlGenericErrorContext,
        "xsltCompilerNodePop: Top-node mismatch.\n");
    return;
    }
    /*
    * NOTE: Be carefull with the @node, since it might be
    *  a doc-node.
    */
    if (cctxt->inode->node != node) {
    xmlGenericError(xmlGenericErrorContext,
    "xsltCompilerNodePop: Node mismatch.\n");
    goto mismatch;
    }
    if (cctxt->inode->depth != cctxt->depth) {
    xmlGenericError(xmlGenericErrorContext,
    "xsltCompilerNodePop: Depth mismatch.\n");
    goto mismatch;
    }
    /*
    * Pop information of variables.
    */
    if ((cctxt->ivar) && (cctxt->ivar->depth > cctxt->depth))
    xsltCompilerVarInfoPop(cctxt);

    cctxt->depth--;
    cctxt->inode = cctxt->inode->prev;
    if (cctxt->inode != NULL)
    cctxt->inode->curChildType = 0;
    return;

mismatch:
    {
    const xmlChar *nsName = NULL, *name = NULL;
    const xmlChar *infnsName = NULL, *infname = NULL;
    
    if (node) {
        if (node->type == XML_ELEMENT_NODE) {
        name = node->name;
        if (node->ns != NULL)
            nsName = node->ns->href;
        else
            nsName = BAD_CAST "";
        } else {
        name = BAD_CAST "#document";
        nsName = BAD_CAST "";
        }
    } else
        name = BAD_CAST "Not given";

    if (cctxt->inode->node) {
        if (node->type == XML_ELEMENT_NODE) {
        infname = cctxt->inode->node->name;
        if (cctxt->inode->node->ns != NULL)
            infnsName = cctxt->inode->node->ns->href;
        else
            infnsName = BAD_CAST "";
        } else {
        infname = BAD_CAST "#document";
        infnsName = BAD_CAST "";
        }
    } else
        infname = BAD_CAST "Not given";

    
    xmlGenericError(xmlGenericErrorContext,
        "xsltCompilerNodePop: Given   : '%s' URI '%s'\n",
        name, nsName);
    xmlGenericError(xmlGenericErrorContext,
        "xsltCompilerNodePop: Expected: '%s' URI '%s'\n",
        infname, infnsName);
    }
}

/*
* xsltCompilerBuildInScopeNsList:
*
* Create and store the list of in-scope namespaces for the given
* node in the stylesheet. If there are no changes in the in-scope
* namespaces then the last ns-info of the ancestor axis will be returned.
* Compilation-time only.
*
* Returns the ns-info or NULL if there are no namespaces in scope.
*/
static xsltNsListContainerPtr
xsltCompilerBuildInScopeNsList(xsltCompilerCtxtPtr cctxt, xmlNodePtr node)
{
    xsltNsListContainerPtr nsi = NULL;
    xmlNsPtr *list = NULL, ns;
    int i, maxns = 5;
    /*
    * Create a new ns-list for this position in the node-tree.
    * xmlGetNsList() will return NULL, if there are no ns-decls in the
    * tree. Note that the ns-decl for the XML namespace is not added
    * to the resulting list; the XPath module handles the XML namespace
    * internally.
    */
    while (node != NULL) {
        if (node->type == XML_ELEMENT_NODE) {
            ns = node->nsDef;
            while (ns != NULL) {
                if (nsi == NULL) {
            nsi = (xsltNsListContainerPtr)
            xmlMalloc(sizeof(xsltNsListContainer));
            if (nsi == NULL) {
            xsltTransformError(NULL, cctxt->style, NULL,
                "xsltCompilerBuildInScopeNsList: "
                "malloc failed!\n");
            goto internal_err;
            }
            memset(nsi, 0, sizeof(xsltNsListContainer));
                    nsi->list =
                        (xmlNsPtr *) xmlMalloc(maxns * sizeof(xmlNsPtr));
                    if (nsi->list == NULL) {
            xsltTransformError(NULL, cctxt->style, NULL,
                "xsltCompilerBuildInScopeNsList: "
                "malloc failed!\n");
            goto internal_err;
                    }
                    nsi->list[0] = NULL;
                }
        /*
        * Skip shadowed namespace bindings.
        */
                for (i = 0; i < nsi->totalNumber; i++) {
                    if ((ns->prefix == nsi->list[i]->prefix) ||
                        (xmlStrEqual(ns->prefix, nsi->list[i]->prefix)))
            break;
                }
                if (i >= nsi->totalNumber) {
                    if (nsi->totalNumber +1 >= maxns) {
                        maxns *= 2;
            nsi->list =
                (xmlNsPtr *) xmlRealloc(nsi->list,
                maxns * sizeof(xmlNsPtr));
                        if (nsi->list == NULL) {
                            xsltTransformError(NULL, cctxt->style, NULL,
                "xsltCompilerBuildInScopeNsList: "
                "realloc failed!\n");
                goto internal_err;
                        }
                    }
                    nsi->list[nsi->totalNumber++] = ns;
                    nsi->list[nsi->totalNumber] = NULL;
                }

                ns = ns->next;
            }
        }
        node = node->parent;
    }
    if (nsi == NULL)
    return(NULL);
    /*
    * Move the default namespace to last position.
    */
    nsi->xpathNumber = nsi->totalNumber;
    for (i = 0; i < nsi->totalNumber; i++) {
    if (nsi->list[i]->prefix == NULL) {
        ns = nsi->list[i];
        nsi->list[i] = nsi->list[nsi->totalNumber-1];
        nsi->list[nsi->totalNumber-1] = ns;
        nsi->xpathNumber--;
        break;
    }
    }
    /*
    * Store the ns-list in the stylesheet.
    */
    if (xsltPointerListAddSize(
    (xsltPointerListPtr)cctxt->psData->inScopeNamespaces,
    (void *) nsi, 5) == -1)
    {   
    xmlFree(nsi);
    nsi = NULL;
    xsltTransformError(NULL, cctxt->style, NULL,
        "xsltCompilerBuildInScopeNsList: failed to add ns-info.\n");
    goto internal_err;
    }
    /*
    * Notify of change in status wrt namespaces.
    */
    if (cctxt->inode != NULL)
    cctxt->inode->nsChanged = 1;

    return(nsi);

internal_err:
    if (list != NULL)
    xmlFree(list);    
    cctxt->style->errors++;
    return(NULL);
}

static int
xsltParseNsPrefixList(xsltCompilerCtxtPtr cctxt,
              xsltPointerListPtr list,
              xmlNodePtr node,
              const xmlChar *value)
{
    xmlChar *cur, *end;
    xmlNsPtr ns;
    
    if ((cctxt == NULL) || (value == NULL) || (list == NULL))
    return(-1);

    list->number = 0;

    cur = (xmlChar *) value;
    while (*cur != 0) {
    while (IS_BLANK(*cur)) cur++;
    if (*cur == 0)
        break;
    end = cur;
    while ((*end != 0) && (!IS_BLANK(*end))) end++;
    cur = xmlStrndup(cur, end - cur);
    if (cur == NULL) {
        cur = end;
        continue;
    }       
    /*
    * TODO: Export and use xmlSearchNsByPrefixStrict()
    *   in Libxml2, tree.c, since xmlSearchNs() is in most
    *   cases not efficient and in some cases not correct.
    *
    * XSLT-2 TODO: XSLT 2.0 allows an additional "#all" value.
    */
    if ((cur[0] == '#') &&
        xmlStrEqual(cur, (const xmlChar *)"#default"))
        ns = xmlSearchNs(cctxt->style->doc, node, NULL);
    else
        ns = xmlSearchNs(cctxt->style->doc, node, cur);     

    if (ns == NULL) {
        /*
        * TODO: Better to report the attr-node, otherwise
        *  the user won't know which attribute was invalid.
        */
        xsltTransformError(NULL, cctxt->style, node,
        "No namespace binding in scope for prefix '%s'.\n", cur);
        /*
        * XSLT-1.0: "It is an error if there is no namespace
        *  bound to the prefix on the element bearing the
        *  exclude-result-prefixes or xsl:exclude-result-prefixes
        *  attribute."
        */
        cctxt->style->errors++;
    } else {
#ifdef WITH_XSLT_DEBUG_PARSING
        xsltGenericDebug(xsltGenericDebugContext,
        "resolved prefix '%s'\n", cur);
#endif
        /*
        * Note that we put the namespace name into the dict.
        */
        if (xsltPointerListAddSize(list,
        (void *) xmlDictLookup(cctxt->style->dict,
        ns->href, -1), 5) == -1)
        {
        xmlFree(cur);
        goto internal_err;
        }
    }
    xmlFree(cur);
        
    cur = end;
    }
    return(0);

internal_err:
    cctxt->style->errors++;
    return(-1);
}

static xsltPointerListPtr
xsltCompilerUtilsCreateMergedList(xsltPointerListPtr first,
                xsltPointerListPtr second)
{
    xsltPointerListPtr ret;
    size_t num;

    if (first)
    num = first->number;
    else
    num = 0;
    if (second)
    num += second->number;    
    if (num == 0)
    return(NULL);
    ret = xsltPointerListCreate(num);
    if (ret == NULL)
    return(NULL);
    /*
    * Copy contents.
    */
    if ((first != NULL) &&  (first->number != 0)) {
    memcpy(ret->items, first->items,
        first->number * sizeof(void *));
    if ((second != NULL) && (second->number != 0))
        memcpy(ret->items + first->number, second->items,
        second->number * sizeof(void *));
    } else if ((second != NULL) && (second->number != 0))
    memcpy(ret->items, (void *) second->items,
        second->number * sizeof(void *));
    ret->number = num;
    return(ret);
}

/*
* xsltParseExclResultPrefixes:
*
* Create and store the list of in-scope namespaces for the given
* node in the stylesheet. If there are no changes in the in-scope
* namespaces then the last ns-info of the ancestor axis will be returned.
* Compilation-time only.
*
* Returns the ns-info or NULL if there are no namespaces in scope.
*/
static xsltPointerListPtr
xsltParseExclResultPrefixes(xsltCompilerCtxtPtr cctxt, xmlNodePtr node,
                xsltPointerListPtr def,
                int instrCategory)
{    
    xsltPointerListPtr list = NULL;
    xmlChar *value;
    xmlAttrPtr attr;

    if ((cctxt == NULL) || (node == NULL))
    return(NULL);

    if (instrCategory == XSLT_ELEMENT_CATEGORY_XSLT)
    attr = xmlHasNsProp(node, BAD_CAST "exclude-result-prefixes", NULL);
    else
    attr = xmlHasNsProp(node, BAD_CAST "exclude-result-prefixes",
        XSLT_NAMESPACE);
    if (attr == NULL)   
    return(def);

    if (attr && (instrCategory == XSLT_ELEMENT_CATEGORY_LRE)) {
    /*
    * Mark the XSLT attr.
    */
    attr->psvi = (void *) xsltXSLTAttrMarker;
    }

    if ((attr->children != NULL) && 
    (attr->children->content != NULL))
    value = attr->children->content;
    else {
    xsltTransformError(NULL, cctxt->style, node,
        "Attribute 'exclude-result-prefixes': Invalid value.\n");
    cctxt->style->errors++;
    return(def);
    }        

    if (xsltParseNsPrefixList(cctxt, cctxt->tmpList, node,
    BAD_CAST value) != 0)
    goto exit;
    if (cctxt->tmpList->number == 0)    
    goto exit;    
    /*
    * Merge the list with the inherited list.
    */
    list = xsltCompilerUtilsCreateMergedList(def, cctxt->tmpList);
    if (list == NULL)
    goto exit;    
    /*
    * Store the list in the stylesheet/compiler context.
    */
    if (xsltPointerListAddSize(
    cctxt->psData->exclResultNamespaces, list, 5) == -1)
    {
    xsltPointerListFree(list);
    list = NULL;
    goto exit;
    }
    /*
    * Notify of change in status wrt namespaces.
    */
    if (cctxt->inode != NULL)
    cctxt->inode->nsChanged = 1;

exit:    
    if (list != NULL)
    return(list);
    else
    return(def);
}

/*
* xsltParseExtElemPrefixes:
*
* Create and store the list of in-scope namespaces for the given
* node in the stylesheet. If there are no changes in the in-scope
* namespaces then the last ns-info of the ancestor axis will be returned.
* Compilation-time only.
*
* Returns the ns-info or NULL if there are no namespaces in scope.
*/
static xsltPointerListPtr
xsltParseExtElemPrefixes(xsltCompilerCtxtPtr cctxt, xmlNodePtr node,
             xsltPointerListPtr def,
             int instrCategory)
{    
    xsltPointerListPtr list = NULL;
    xmlAttrPtr attr;
    xmlChar *value;
    int i;

    if ((cctxt == NULL) || (node == NULL))
    return(NULL);

    if (instrCategory == XSLT_ELEMENT_CATEGORY_XSLT)
    attr = xmlHasNsProp(node, BAD_CAST "extension-element-prefixes", NULL);
    else
    attr = xmlHasNsProp(node, BAD_CAST "extension-element-prefixes",
        XSLT_NAMESPACE);
    if (attr == NULL)   
    return(def);

    if (attr && (instrCategory == XSLT_ELEMENT_CATEGORY_LRE)) {
    /*
    * Mark the XSLT attr.
    */
    attr->psvi = (void *) xsltXSLTAttrMarker;
    }

    if ((attr->children != NULL) && 
    (attr->children->content != NULL))
    value = attr->children->content;
    else {
    xsltTransformError(NULL, cctxt->style, node,
        "Attribute 'extension-element-prefixes': Invalid value.\n");
    cctxt->style->errors++;
    return(def);
    }


    if (xsltParseNsPrefixList(cctxt, cctxt->tmpList, node,
    BAD_CAST value) != 0)
    goto exit;

    if (cctxt->tmpList->number == 0)
    goto exit;    
    /*
    * REVISIT: Register the extension namespaces.
    */
    for (i = 0; i < cctxt->tmpList->number; i++)
    xsltRegisterExtPrefix(cctxt->style, NULL,
    BAD_CAST cctxt->tmpList->items[i]);
    /*
    * Merge the list with the inherited list.
    */
    list = xsltCompilerUtilsCreateMergedList(def, cctxt->tmpList);
    if (list == NULL)
    goto exit;
    /*
    * Store the list in the stylesheet.
    */
    if (xsltPointerListAddSize(
    cctxt->psData->extElemNamespaces, list, 5) == -1)
    {
    xsltPointerListFree(list);
    list = NULL;
    goto exit;
    }
    /*
    * Notify of change in status wrt namespaces.
    */
    if (cctxt->inode != NULL)
    cctxt->inode->nsChanged = 1;

exit:    
    if (list != NULL)
    return(list);
    else
    return(def);
}

/*
* xsltParseAttrXSLTVersion:
*
* @cctxt: the compilation context
* @node: the element-node
* @isXsltElem: whether this is an XSLT element
*
* Parses the attribute xsl:version.
*
* Returns 1 if there was such an attribute, 0 if not and
*         -1 if an internal or API error occured.
*/
static int
xsltParseAttrXSLTVersion(xsltCompilerCtxtPtr cctxt, xmlNodePtr node,             
             int instrCategory)
{
    xmlChar *value;
    xmlAttrPtr attr;

    if ((cctxt == NULL) || (node == NULL))
    return(-1);

    if (instrCategory == XSLT_ELEMENT_CATEGORY_XSLT)
    attr = xmlHasNsProp(node, BAD_CAST "version", NULL);
    else
    attr = xmlHasNsProp(node, BAD_CAST "version", XSLT_NAMESPACE);

    if (attr == NULL)   
    return(0);

    attr->psvi = (void *) xsltXSLTAttrMarker;

    if ((attr->children != NULL) && 
    (attr->children->content != NULL))
    value = attr->children->content;
    else {
    xsltTransformError(NULL, cctxt->style, node,
        "Attribute 'version': Invalid value.\n");
    cctxt->style->errors++;
    return(1);
    }
    
    if (! xmlStrEqual(value, (const xmlChar *)"1.0")) {
    cctxt->inode->forwardsCompat = 1;
    /*
    * TODO: To what extent do we support the
    *  forwards-compatible mode?
    */
    /*
    * Report this only once per compilation episode.
    */
    if (! cctxt->hasForwardsCompat) {
        cctxt->hasForwardsCompat = 1;
        cctxt->errSeverity = XSLT_ERROR_SEVERITY_WARNING;
        xsltTransformError(NULL, cctxt->style, node,
        "Warning: the attribute xsl:version specifies a value "
        "different from '1.0'. Switching to forwards-compatible "
        "mode. Only features of XSLT 1.0 are supported by this "
        "processor.\n");
        cctxt->style->warnings++;
        cctxt->errSeverity = XSLT_ERROR_SEVERITY_ERROR;
    }   
    } else {
    cctxt->inode->forwardsCompat = 0;
    }

    if (attr && (instrCategory == XSLT_ELEMENT_CATEGORY_LRE)) {
    /*
    * Set a marker on XSLT attributes.
    */
    attr->psvi = (void *) xsltXSLTAttrMarker;
    }
    return(1);
}

static int
xsltParsePreprocessStylesheetTree(xsltCompilerCtxtPtr cctxt, xmlNodePtr node)
{
    xmlNodePtr deleteNode, cur, txt, textNode = NULL;
    xmlDocPtr doc;
    xsltStylesheetPtr style;
    int internalize = 0, findSpaceAttr;
    int xsltStylesheetElemDepth;
    xmlAttrPtr attr;
    xmlChar *value;
    const xmlChar *name, *nsNameXSLT = NULL;
    int strictWhitespace, inXSLText = 0;
#ifdef XSLT_REFACTORED_XSLT_NSCOMP
    xsltNsMapPtr nsMapItem;
#endif

    if ((cctxt == NULL) || (cctxt->style == NULL) ||
    (node == NULL) || (node->type != XML_ELEMENT_NODE))
        return(-1);

    doc = node->doc;
    if (doc == NULL)
    goto internal_err;

    style = cctxt->style;
    if ((style->dict != NULL) && (doc->dict == style->dict))
    internalize = 1;
    else
        style->internalized = 0;

    /*
    * Init value of xml:space. Since this might be an embedded
    * stylesheet, this is needed to be performed on the element
    * where the stylesheet is rooted at, taking xml:space of
    * ancestors into account.
    */
    if (! cctxt->simplified)
    xsltStylesheetElemDepth = cctxt->depth +1;
    else
    xsltStylesheetElemDepth = 0;

    if (xmlNodeGetSpacePreserve(node) != 1)
    cctxt->inode->preserveWhitespace = 0;
    else
    cctxt->inode->preserveWhitespace = 1; 
    
    /*
    * Eval if we should keep the old incorrect behaviour.
    */
    strictWhitespace = (cctxt->strict != 0) ? 1 : 0;

    nsNameXSLT = xsltConstNamespaceNameXSLT;

    deleteNode = NULL;
    cur = node;
    while (cur != NULL) {
    if (deleteNode != NULL) {

#ifdef WITH_XSLT_DEBUG_BLANKS
        xsltGenericDebug(xsltGenericDebugContext,
         "xsltParsePreprocessStylesheetTree: removing node\n");
#endif
        xmlUnlinkNode(deleteNode);
        xmlFreeNode(deleteNode);
        deleteNode = NULL;
    }
    if (cur->type == XML_ELEMENT_NODE) {
        
        /*
        * Clear the PSVI field.
        */
        cur->psvi = NULL;

        xsltCompilerNodePush(cctxt, cur);

        inXSLText = 0;
        textNode = NULL;        
        findSpaceAttr = 1;      
        cctxt->inode->stripWhitespace = 0;
        /*
        * TODO: I'd love to use a string pointer comparison here :-/
        */
        if (IS_XSLT_ELEM(cur)) {
#ifdef XSLT_REFACTORED_XSLT_NSCOMP
        if (cur->ns->href != nsNameXSLT) {
            nsMapItem = xsltNewNamespaceMapItem(cctxt,
            doc, cur->ns, cur);
            if (nsMapItem == NULL)
            goto internal_err;
            cur->ns->href = nsNameXSLT;
        }
#endif

        if (cur->name == NULL)
            goto process_attributes;
        /*
        * Mark the XSLT element for later recognition.
        * TODO: Using the marker is still too dangerous, since if
        *   the parsing mechanism leaves out an XSLT element, then
        *   this might hit the transformation-mechanism, which
        *   will break if it doesn't expect such a marker.
        */
        /* cur->psvi = (void *) xsltXSLTElemMarker; */

        /*
        * XSLT 2.0: "Any whitespace text node whose parent is
        * one of the following elements is removed from the "
        * tree, regardless of any xml:space attributes:..."
        * xsl:apply-imports, 
        * xsl:apply-templates,
        * xsl:attribute-set,
        * xsl:call-template, 
        * xsl:choose,
        * xsl:stylesheet, xsl:transform.
        * XSLT 2.0: xsl:analyze-string,
        *           xsl:character-map,
        *           xsl:next-match      
        *
        * TODO: I'd love to use a string pointer comparison here :-/
        */      
        name = cur->name;
        switch (*name) {
            case 't':
            if ((name[0] == 't') && (name[1] == 'e') &&
                (name[2] == 'x') && (name[3] == 't') &&
                (name[4] == 0))
            {
                /*
                * Process the xsl:text element.
                * ----------------------------
                * Mark it for later recognition.
                */
                cur->psvi = (void *) xsltXSLTTextMarker;
                /*
                * For stylesheets, the set of
                * whitespace-preserving element names
                * consists of just xsl:text.
                */
                findSpaceAttr = 0;
                cctxt->inode->preserveWhitespace = 1;
                inXSLText = 1;
            }               
            break;
            case 'c':
            if (xmlStrEqual(name, BAD_CAST "choose") ||
                xmlStrEqual(name, BAD_CAST "call-template"))
                cctxt->inode->stripWhitespace = 1;
            break;
            case 'a':
            if (xmlStrEqual(name, BAD_CAST "apply-templates") ||
                xmlStrEqual(name, BAD_CAST "apply-imports") ||
                xmlStrEqual(name, BAD_CAST "attribute-set"))

                cctxt->inode->stripWhitespace = 1;
            break;
            default:
            if (xsltStylesheetElemDepth == cctxt->depth) {
                /*
                * This is a xsl:stylesheet/xsl:transform.
                */
                cctxt->inode->stripWhitespace = 1;
                break;
            }

            if ((cur->prev != NULL) &&
                (cur->prev->type == XML_TEXT_NODE))
            {
                /*
                * XSLT 2.0 : "Any whitespace text node whose
                *  following-sibling node is an xsl:param or
                *  xsl:sort element is removed from the tree,
                *  regardless of any xml:space attributes."
                */
                if (((*name == 'p') || (*name == 's')) &&
                (xmlStrEqual(name, BAD_CAST "param") ||
                 xmlStrEqual(name, BAD_CAST "sort")))
                {
                do {
                    if (IS_BLANK_NODE(cur->prev)) {
                    txt = cur->prev;
                    xmlUnlinkNode(txt);
                    xmlFreeNode(txt);
                    } else {
                    /*
                    * This will result in a content
                    * error, when hitting the parsing
                    * functions.
                    */
                    break;
                    }
                } while (cur->prev);                    
                }
            }
            break;
        }
        }

process_attributes:
        /*
        * Process attributes.
        * ------------------
        */
        if (cur->properties != NULL) {
        if (cur->children == NULL)
            findSpaceAttr = 0;
        attr = cur->properties;
        do {
#ifdef XSLT_REFACTORED_XSLT_NSCOMP
            if ((attr->ns) && (attr->ns->href != nsNameXSLT) &&
            xmlStrEqual(attr->ns->href, nsNameXSLT))
            {           
            nsMapItem = xsltNewNamespaceMapItem(cctxt,
                doc, attr->ns, cur);
            if (nsMapItem == NULL)
                goto internal_err;
            attr->ns->href = nsNameXSLT;
            }           
#endif
            if (internalize) {
            /*
            * Internalize the attribute's value; the goal is to
            * speed up operations and minimize used space by
            * compiled stylesheets.
            */
            txt = attr->children;
            /*
            * NOTE that this assumes only one
            *  text-node in the attribute's content.
            */
            if ((txt != NULL) && (txt->content != NULL) &&
                (!xmlDictOwns(style->dict, txt->content)))
            {
                value = (xmlChar *) xmlDictLookup(style->dict,
                txt->content, -1);
                xmlNodeSetContent(txt, NULL);
                txt->content = value;
            }
            }
            /*
            * Process xml:space attributes.
            * ----------------------------
            */
            if ((findSpaceAttr != 0) &&
            (attr->ns != NULL) &&
            (attr->name != NULL) &&
            (attr->name[0] == 's') &&           
            (attr->ns->prefix != NULL) &&
            (attr->ns->prefix[0] == 'x') &&
            (attr->ns->prefix[1] == 'm') &&
            (attr->ns->prefix[2] == 'l') &&
            (attr->ns->prefix[3] == 0))
            {
            value = xmlGetNsProp(cur, BAD_CAST "space",
                XML_XML_NAMESPACE);
            if (value != NULL) {
                if (xmlStrEqual(value, BAD_CAST "preserve")) {
                cctxt->inode->preserveWhitespace = 1;               
                } else if (xmlStrEqual(value, BAD_CAST "default")) {
                cctxt->inode->preserveWhitespace = 0;
                } else {
                /* Invalid value for xml:space. */
                xsltTransformError(NULL, style, cur,
                    "Attribute xml:space: Invalid value.\n");
                cctxt->style->warnings++;
                }
                findSpaceAttr = 0;
                xmlFree(value);
            }
            
            }
            attr = attr->next;
        } while (attr != NULL);
        }
        /*
        * We'll descend into the children of element nodes only.
        */
        if (cur->children != NULL) {
        cur = cur->children;
        continue;
        }
    } else if ((cur->type == XML_TEXT_NODE) ||
        (cur->type == XML_CDATA_SECTION_NODE))
    {
        /*
        * Merge adjacent text/CDATA-section-nodes
        * ---------------------------------------       
        * In order to avoid breaking of existing stylesheets,
        * if the old behaviour is wanted (strictWhitespace == 0),
        * then we *won't* merge adjacent text-nodes
        * (except in xsl:text); this will ensure that whitespace-only
        * text nodes are (incorrectly) not stripped in some cases.
        * 
        * Example:               : <foo>  <!-- bar -->zoo</foo>
        * Corrent (strict) result: <foo>  zoo</foo>
        * Incorrect (old) result : <foo>zoo</foo>
        *    
        * NOTE that we *will* merge adjacent text-nodes if
        * they are in xsl:text.
        * Example, the following:
        * <xsl:text>  <!-- bar -->zoo<xsl:text>
        * will result in both cases in:
        * <xsl:text>  zoo<xsl:text>
        */
        cur->type = XML_TEXT_NODE;
        if ((strictWhitespace != 0) || (inXSLText != 0)) {
        /*
        * New behaviour; merge nodes.
        */
        if (textNode == NULL)
            textNode = cur;
        else {
            if (cur->content != NULL)
            xmlNodeAddContent(textNode, cur->content);
            deleteNode = cur;
        }
        if ((cur->next == NULL) ||
            (cur->next->type == XML_ELEMENT_NODE))
            goto end_of_text;
        else
            goto next_sibling;
        } else {
        /*
        * Old behaviour.
        */
        if (textNode == NULL)
            textNode = cur;
        goto end_of_text;
        }              
    } else if ((cur->type == XML_COMMENT_NODE) ||
        (cur->type == XML_PI_NODE))
    {       
        /*
        * Remove processing instructions and comments.
        */
        deleteNode = cur;
        if ((cur->next == NULL) ||
        (cur->next->type == XML_ELEMENT_NODE))
        goto end_of_text;
        else
        goto next_sibling;
    } else {
        textNode = NULL;
        /*
        * Invalid node-type for this data-model.
        */
        xsltTransformError(NULL, style, cur,
        "Invalid type of node for the XSLT data model.\n");
        cctxt->style->errors++;
        goto next_sibling;
    }

end_of_text:
    if (textNode) {
        value = textNode->content;
        /*
        * At this point all adjacent text/CDATA-section nodes
        * have been merged.
        *
        * Strip whitespace-only text-nodes.
        * (cctxt->inode->stripWhitespace)
        */
        if ((value == NULL) || (*value == 0) ||
        (((cctxt->inode->stripWhitespace) ||
          (! cctxt->inode->preserveWhitespace)) &&
         IS_BLANK(*value) &&
         xsltIsBlank(value)))
        {       
        if (textNode != cur) {
            xmlUnlinkNode(textNode);
            xmlFreeNode(textNode);
        } else
            deleteNode = textNode;
        textNode = NULL;
        goto next_sibling;
        }
        /*
        * Convert CDATA-section nodes to text-nodes.
        * TODO: Can this produce problems?
        */
        if (textNode->type != XML_TEXT_NODE) {
        textNode->type = XML_TEXT_NODE;
        textNode->name = xmlStringText;
        }
        if (internalize &&
        (textNode->content != NULL) &&
        (!xmlDictOwns(style->dict, textNode->content)))
        {
        /*
        * Internalize the string.
        */
        value = (xmlChar *) xmlDictLookup(style->dict,
            textNode->content, -1);
        xmlNodeSetContent(textNode, NULL);
        textNode->content = value;
        }
        textNode = NULL;
        /*
        * Note that "disable-output-escaping" of the xsl:text
        * element will be applied at a later level, when
        * XSLT elements are processed.
        */
    }

next_sibling:
    if (cur->type == XML_ELEMENT_NODE) {
        xsltCompilerNodePop(cctxt, cur);
    }
    if (cur == node)
        break;
    if (cur->next != NULL) {
        cur = cur->next;
    } else {
        cur = cur->parent;
        inXSLText = 0;
        goto next_sibling;
    };
    }
    if (deleteNode != NULL) {
#ifdef WITH_XSLT_DEBUG_PARSING
    xsltGenericDebug(xsltGenericDebugContext,
     "xsltParsePreprocessStylesheetTree: removing node\n");
#endif
    xmlUnlinkNode(deleteNode);
    xmlFreeNode(deleteNode);
    }
    return(0);

internal_err:
    return(-1);
}

#endif /* XSLT_REFACTORED */

#ifdef XSLT_REFACTORED
#else
static void
xsltPrecomputeStylesheet(xsltStylesheetPtr style, xmlNodePtr cur)
{
    xmlNodePtr deleteNode, styleelem;
    int internalize = 0;

    if ((style == NULL) || (cur == NULL))
        return;

    if ((cur->doc != NULL) && (style->dict != NULL) &&
        (cur->doc->dict == style->dict))
    internalize = 1;
    else
        style->internalized = 0;

    if ((cur != NULL) && (IS_XSLT_ELEM(cur)) &&
        (IS_XSLT_NAME(cur, "stylesheet"))) {
    styleelem = cur;
    } else {
        styleelem = NULL;
    }

    /*
     * This content comes from the stylesheet
     * For stylesheets, the set of whitespace-preserving
     * element names consists of just xsl:text.
     */
    deleteNode = NULL;
    while (cur != NULL) {
    if (deleteNode != NULL) {
#ifdef WITH_XSLT_DEBUG_BLANKS
        xsltGenericDebug(xsltGenericDebugContext,
         "xsltPrecomputeStylesheet: removing ignorable blank node\n");
#endif
        xmlUnlinkNode(deleteNode);
        xmlFreeNode(deleteNode);
        deleteNode = NULL;
    }
    if (cur->type == XML_ELEMENT_NODE) {
        int exclPrefixes;
        /*
         * Internalize attributes values.
         */
        if ((internalize) && (cur->properties != NULL)) {
            xmlAttrPtr attr = cur->properties;
        xmlNodePtr txt;

        while (attr != NULL) {
            txt = attr->children;
            if ((txt != NULL) && (txt->type == XML_TEXT_NODE) &&
                (txt->content != NULL) &&
            (!xmlDictOwns(style->dict, txt->content)))
            {
            xmlChar *tmp;

            /*
             * internalize the text string, goal is to speed
             * up operations and minimize used space by compiled
             * stylesheets.
             */
            tmp = (xmlChar *) xmlDictLookup(style->dict,
                                            txt->content, -1);
            if (tmp != txt->content) {
                xmlNodeSetContent(txt, NULL);
                txt->content = tmp;
            }
            }
            attr = attr->next;
        }
        }
        if (IS_XSLT_ELEM(cur)) {
        exclPrefixes = 0;
        xsltStylePreCompute(style, cur);
        if (IS_XSLT_NAME(cur, "text")) {
            for (;exclPrefixes > 0;exclPrefixes--)
            exclPrefixPop(style);
            goto skip_children;
        }
        } else {
        exclPrefixes = xsltParseStylesheetExcludePrefix(style, cur, 0);
        }
                 
        if ((cur->nsDef != NULL) && (style->exclPrefixNr > 0)) {
        xmlNsPtr ns = cur->nsDef, prev = NULL, next;
        xmlNodePtr root = NULL;
        int i, moved;

        root = xmlDocGetRootElement(cur->doc);
        if ((root != NULL) && (root != cur)) {
            while (ns != NULL) {
            moved = 0;
            next = ns->next;
            for (i = 0;i < style->exclPrefixNr;i++) {
                if ((ns->prefix != NULL) && 
                    (xmlStrEqual(ns->href,
                         style->exclPrefixTab[i]))) {
                /*
                 * Move the namespace definition on the root
                 * element to avoid duplicating it without
                 * loosing it.
                 */
                if (prev == NULL) {
                    cur->nsDef = ns->next;
                } else {
                    prev->next = ns->next;
                }
                ns->next = root->nsDef;
                root->nsDef = ns;
                moved = 1;
                break;
                }
            }
            if (moved == 0)
                prev = ns;
            ns = next;
            }
        }
        }
        /*
         * If we have prefixes locally, recurse and pop them up when
         * going back
         */
        if (exclPrefixes > 0) {
        xsltPrecomputeStylesheet(style, cur->children);
        for (;exclPrefixes > 0;exclPrefixes--)
            exclPrefixPop(style);
        goto skip_children;
        }
    } else if (cur->type == XML_TEXT_NODE) {
        if (IS_BLANK_NODE(cur)) {
        if (xmlNodeGetSpacePreserve(cur) != 1) {
            deleteNode = cur;
        }
        } else if ((cur->content != NULL) && (internalize) &&
                   (!xmlDictOwns(style->dict, cur->content))) {
        xmlChar *tmp;

        /*
         * internalize the text string, goal is to speed
         * up operations and minimize used space by compiled
         * stylesheets.
         */
        tmp = (xmlChar *) xmlDictLookup(style->dict, cur->content, -1);
        xmlNodeSetContent(cur, NULL);
        cur->content = tmp;
        }
    } else if ((cur->type != XML_ELEMENT_NODE) &&
           (cur->type != XML_CDATA_SECTION_NODE)) {
        deleteNode = cur;
        goto skip_children;
    }

    /*
     * Skip to next node. In case of a namespaced element children of
     * the stylesheet and not in the XSLT namespace and not an extension
     * element, ignore its content.
     */
    if ((cur->type == XML_ELEMENT_NODE) && (cur->ns != NULL) &&
        (styleelem != NULL) && (cur->parent == styleelem) &&
        (!xmlStrEqual(cur->ns->href, XSLT_NAMESPACE)) &&
        (!xsltCheckExtURI(style, cur->ns->href))) {
        goto skip_children;
    } else if (cur->children != NULL) {
        if ((cur->children->type != XML_ENTITY_DECL) &&
        (cur->children->type != XML_ENTITY_REF_NODE) &&
        (cur->children->type != XML_ENTITY_NODE)) {
        cur = cur->children;
        continue;
        }
    }

skip_children:
    if (cur->next != NULL) {
        cur = cur->next;
        continue;
    }
    do {

        cur = cur->parent;
        if (cur == NULL)
        break;
        if (cur == (xmlNodePtr) style->doc) {
        cur = NULL;
        break;
        }
        if (cur->next != NULL) {
        cur = cur->next;
        break;
        }
    } while (cur != NULL);
    }
    if (deleteNode != NULL) {
#ifdef WITH_XSLT_DEBUG_PARSING
    xsltGenericDebug(xsltGenericDebugContext,
     "xsltPrecomputeStylesheet: removing ignorable blank node\n");
#endif
    xmlUnlinkNode(deleteNode);
    xmlFreeNode(deleteNode);
    }
}
#endif /* end of else XSLT_REFACTORED */

static void
xsltGatherNamespaces(xsltStylesheetPtr style) {
    xmlNodePtr cur;
    const xmlChar *URI;

    if (style == NULL)
        return;
    /* 
     * TODO: basically if the stylesheet uses the same prefix for different
     *       patterns, well they may be in problem, hopefully they will get
     *       a warning first.
     */
    /*
    * TODO: Eliminate the use of the hash for XPath expressions.
    *   An expression should be evaluated in the context of the in-scope
    *   namespaces; eliminate the restriction of an XML document to contain
    *   no duplicate prefixes for different namespace names.
    * 
    */
    cur = xmlDocGetRootElement(style->doc);
    while (cur != NULL) {
    if (cur->type == XML_ELEMENT_NODE) {
        xmlNsPtr ns = cur->nsDef;
        while (ns != NULL) {
        if (ns->prefix != NULL) {
            if (style->nsHash == NULL) {
            style->nsHash = xmlHashCreate(10);
            if (style->nsHash == NULL) {
                xsltTransformError(NULL, style, cur,
         "xsltGatherNamespaces: failed to create hash table\n");
                style->errors++;
                return;
            }
            }
            URI = xmlHashLookup(style->nsHash, ns->prefix);
            if ((URI != NULL) && (!xmlStrEqual(URI, ns->href))) {
            xsltTransformError(NULL, style, cur,
         "Namespaces prefix %s used for multiple namespaces\n",ns->prefix);
            style->warnings++;
            } else if (URI == NULL) {
            xmlHashUpdateEntry(style->nsHash, ns->prefix,
                (void *) ns->href, (xmlHashDeallocator)xmlFree);

#ifdef WITH_XSLT_DEBUG_PARSING
            xsltGenericDebug(xsltGenericDebugContext,
         "Added namespace: %s mapped to %s\n", ns->prefix, ns->href);
#endif
            }
        }
        ns = ns->next;
        }
    }

    /*
     * Skip to next node
     */
    if (cur->children != NULL) {
        if (cur->children->type != XML_ENTITY_DECL) {
        cur = cur->children;
        continue;
        }
    }
    if (cur->next != NULL) {
        cur = cur->next;
        continue;
    }
    
    do {
        cur = cur->parent;
        if (cur == NULL)
        break;
        if (cur == (xmlNodePtr) style->doc) {
        cur = NULL;
        break;
        }
        if (cur->next != NULL) {
        cur = cur->next;
        break;
        }
    } while (cur != NULL);
    }
}

#ifdef XSLT_REFACTORED

static xsltStyleType
xsltGetXSLTElementTypeByNode(xsltCompilerCtxtPtr cctxt,
                 xmlNodePtr node)
{
    if ((node == NULL) || (node->type != XML_ELEMENT_NODE) ||
    (node->name == NULL))
    return(0);

    if (node->name[0] == 'a') {
    if (IS_XSLT_NAME(node, "apply-templates"))
        return(XSLT_FUNC_APPLYTEMPLATES);
    else if (IS_XSLT_NAME(node, "attribute"))
        return(XSLT_FUNC_ATTRIBUTE);
    else if (IS_XSLT_NAME(node, "apply-imports"))
        return(XSLT_FUNC_APPLYIMPORTS);
    else if (IS_XSLT_NAME(node, "attribute-set"))
        return(0);

    } else if (node->name[0] == 'c') {
    if (IS_XSLT_NAME(node, "choose"))
        return(XSLT_FUNC_CHOOSE);
    else if (IS_XSLT_NAME(node, "copy"))
        return(XSLT_FUNC_COPY);
    else if (IS_XSLT_NAME(node, "copy-of"))
        return(XSLT_FUNC_COPYOF);
    else if (IS_XSLT_NAME(node, "call-template"))
        return(XSLT_FUNC_CALLTEMPLATE);
    else if (IS_XSLT_NAME(node, "comment"))
        return(XSLT_FUNC_COMMENT);

    } else if (node->name[0] == 'd') {
    if (IS_XSLT_NAME(node, "document"))
        return(XSLT_FUNC_DOCUMENT);
    else if (IS_XSLT_NAME(node, "decimal-format"))
        return(0);

    } else if (node->name[0] == 'e') {
    if (IS_XSLT_NAME(node, "element"))
        return(XSLT_FUNC_ELEMENT);

    } else if (node->name[0] == 'f') {
    if (IS_XSLT_NAME(node, "for-each"))
        return(XSLT_FUNC_FOREACH);
    else if (IS_XSLT_NAME(node, "fallback"))
        return(XSLT_FUNC_FALLBACK);

    } else if (*(node->name) == 'i') {
    if (IS_XSLT_NAME(node, "if"))
        return(XSLT_FUNC_IF);
    else if (IS_XSLT_NAME(node, "include"))
        return(0);
    else if (IS_XSLT_NAME(node, "import"))
        return(0);

    } else if (*(node->name) == 'k') {
    if (IS_XSLT_NAME(node, "key"))
        return(0);

    } else if (*(node->name) == 'm') {
    if (IS_XSLT_NAME(node, "message"))
        return(XSLT_FUNC_MESSAGE);

    } else if (*(node->name) == 'n') {
    if (IS_XSLT_NAME(node, "number"))
        return(XSLT_FUNC_NUMBER);
    else if (IS_XSLT_NAME(node, "namespace-alias"))
        return(0);

    } else if (*(node->name) == 'o') {
    if (IS_XSLT_NAME(node, "otherwise"))
        return(XSLT_FUNC_OTHERWISE);
    else if (IS_XSLT_NAME(node, "output"))
        return(0);

    } else if (*(node->name) == 'p') {
    if (IS_XSLT_NAME(node, "param"))
        return(XSLT_FUNC_PARAM);
    else if (IS_XSLT_NAME(node, "processing-instruction"))
        return(XSLT_FUNC_PI);
    else if (IS_XSLT_NAME(node, "preserve-space"))
        return(0);

    } else if (*(node->name) == 's') {
    if (IS_XSLT_NAME(node, "sort"))
        return(XSLT_FUNC_SORT);
    else if (IS_XSLT_NAME(node, "strip-space"))
        return(0);
    else if (IS_XSLT_NAME(node, "stylesheet"))
        return(0);

    } else if (node->name[0] == 't') {
    if (IS_XSLT_NAME(node, "text"))
        return(XSLT_FUNC_TEXT);
    else if (IS_XSLT_NAME(node, "template"))
        return(0);
    else if (IS_XSLT_NAME(node, "transform"))
        return(0);

    } else if (*(node->name) == 'v') {
    if (IS_XSLT_NAME(node, "value-of"))
        return(XSLT_FUNC_VALUEOF);
    else if (IS_XSLT_NAME(node, "variable"))
        return(XSLT_FUNC_VARIABLE);

    } else if (*(node->name) == 'w') {
    if (IS_XSLT_NAME(node, "when"))
        return(XSLT_FUNC_WHEN);
    if (IS_XSLT_NAME(node, "with-param"))
        return(XSLT_FUNC_WITHPARAM);
    }
    return(0);
}

int
xsltParseAnyXSLTElem(xsltCompilerCtxtPtr cctxt, xmlNodePtr elem)
{
    if ((cctxt == NULL) || (elem == NULL) ||
    (elem->type != XML_ELEMENT_NODE))
    return(-1);

    elem->psvi = NULL;

    if (! (IS_XSLT_ELEM_FAST(elem)))
    return(-1);
    /*
    * Detection of handled content of extension instructions.
    */
    if (cctxt->inode->category == XSLT_ELEMENT_CATEGORY_EXTENSION) {
    cctxt->inode->extContentHandled = 1;
    }
    
    xsltCompilerNodePush(cctxt, elem);
    /*
    * URGENT TODO: Find a way to speed up this annoying redundant
    *  textual node-name and namespace comparison.
    */
    if (cctxt->inode->prev->curChildType != 0)
    cctxt->inode->type = cctxt->inode->prev->curChildType;
    else
    cctxt->inode->type = xsltGetXSLTElementTypeByNode(cctxt, elem);    
    /*
    * Update the in-scope namespaces if needed.
    */
    if (elem->nsDef != NULL)
    cctxt->inode->inScopeNs =
        xsltCompilerBuildInScopeNsList(cctxt, elem);
    /*
    * xsltStylePreCompute():
    *  This will compile the information found on the current
    *  element's attributes. NOTE that this won't process the
    *  children of the instruction.
    */
    xsltStylePreCompute(cctxt->style, elem);
    /*
    * TODO: How to react on errors in xsltStylePreCompute() ?
    */

    /*
    * Validate the content model of the XSLT-element.
    */
    switch (cctxt->inode->type) {   
    case XSLT_FUNC_APPLYIMPORTS:
        /* EMPTY */
        goto empty_content;
    case XSLT_FUNC_APPLYTEMPLATES:
        /* <!-- Content: (xsl:sort | xsl:with-param)* --> */
        goto apply_templates;       
    case XSLT_FUNC_ATTRIBUTE:       
        /* <!-- Content: template --> */
        goto sequence_constructor;
    case XSLT_FUNC_CALLTEMPLATE:
        /* <!-- Content: xsl:with-param* --> */
        goto call_template;
    case XSLT_FUNC_CHOOSE:      
        /* <!-- Content: (xsl:when+, xsl:otherwise?) --> */
        goto choose;
    case XSLT_FUNC_COMMENT:
        /* <!-- Content: template --> */
        goto sequence_constructor;      
    case XSLT_FUNC_COPY:
        /* <!-- Content: template --> */
        goto sequence_constructor;      
    case XSLT_FUNC_COPYOF:
        /* EMPTY */
        goto empty_content;    
    case XSLT_FUNC_DOCUMENT: /* Extra one */
        /* ?? template ?? */
        goto sequence_constructor;
    case XSLT_FUNC_ELEMENT:
        /* <!-- Content: template --> */
        goto sequence_constructor;
    case XSLT_FUNC_FALLBACK:
        /* <!-- Content: template --> */
        goto sequence_constructor;
    case XSLT_FUNC_FOREACH:
        /* <!-- Content: (xsl:sort*, template) --> */
        goto for_each;
    case XSLT_FUNC_IF:
        /* <!-- Content: template --> */
        goto sequence_constructor;
    case XSLT_FUNC_OTHERWISE:
        /* <!-- Content: template --> */
        goto sequence_constructor;
    case XSLT_FUNC_MESSAGE:
        /* <!-- Content: template --> */
        goto sequence_constructor;
    case XSLT_FUNC_NUMBER:
        /* EMPTY */
        goto empty_content;
    case XSLT_FUNC_PARAM:
        /*
        * Check for redefinition.
        */
        if ((elem->psvi != NULL) && (cctxt->ivar != NULL)) {
        xsltVarInfoPtr ivar = cctxt->ivar;

        do {
            if ((ivar->name ==
             ((xsltStyleItemParamPtr) elem->psvi)->name) &&
            (ivar->nsName ==
             ((xsltStyleItemParamPtr) elem->psvi)->ns))
            {
            elem->psvi = NULL;
            xsltTransformError(NULL, cctxt->style, elem,
                "Redefinition of variable or parameter '%s'.\n",
                ivar->name);
            cctxt->style->errors++;
            goto error;
            }
            ivar = ivar->prev;
        } while (ivar != NULL);
        }
        /*  <!-- Content: template --> */
        goto sequence_constructor;
    case XSLT_FUNC_PI:
        /*  <!-- Content: template --> */
        goto sequence_constructor;
    case XSLT_FUNC_SORT:
        /* EMPTY */
        goto empty_content;
    case XSLT_FUNC_TEXT:
        /* <!-- Content: #PCDATA --> */
        goto text;
    case XSLT_FUNC_VALUEOF:
        /* EMPTY */
        goto empty_content;
    case XSLT_FUNC_VARIABLE:
        /*
        * Check for redefinition.
        */
        if ((elem->psvi != NULL) && (cctxt->ivar != NULL)) {
        xsltVarInfoPtr ivar = cctxt->ivar;      

        do {
            if ((ivar->name ==
             ((xsltStyleItemVariablePtr) elem->psvi)->name) &&
            (ivar->nsName ==
             ((xsltStyleItemVariablePtr) elem->psvi)->ns))
            {
            elem->psvi = NULL;
            xsltTransformError(NULL, cctxt->style, elem,
                "Redefinition of variable or parameter '%s'.\n",
                ivar->name);
            cctxt->style->errors++;
            goto error;
            }
            ivar = ivar->prev;
        } while (ivar != NULL);
        }
        /* <!-- Content: template --> */
        goto sequence_constructor;
    case XSLT_FUNC_WHEN:
        /* <!-- Content: template --> */
        goto sequence_constructor;
    case XSLT_FUNC_WITHPARAM:
        /* <!-- Content: template --> */
        goto sequence_constructor;
    default:
#ifdef WITH_XSLT_DEBUG_PARSING
        xsltGenericDebug(xsltGenericDebugContext,
        "xsltParseXSLTNode: Unhandled XSLT element '%s'.\n",
        elem->name);        
#endif
        xsltTransformError(NULL, cctxt->style, elem,
        "xsltParseXSLTNode: Internal error; "
        "unhandled XSLT element '%s'.\n", elem->name);
        cctxt->style->errors++;
        goto internal_err;
    }

apply_templates:
    /* <!-- Content: (xsl:sort | xsl:with-param)* --> */
    if (elem->children != NULL) {
    xmlNodePtr child = elem->children;
    do {
        if (child->type == XML_ELEMENT_NODE) {
        if (IS_XSLT_ELEM_FAST(child)) {
            if (xmlStrEqual(child->name, BAD_CAST "with-param")) {
            cctxt->inode->curChildType = XSLT_FUNC_WITHPARAM;
            xsltParseAnyXSLTElem(cctxt, child);
            } else if (xmlStrEqual(child->name, BAD_CAST "sort")) {
            cctxt->inode->curChildType = XSLT_FUNC_SORT;
            xsltParseAnyXSLTElem(cctxt, child);
            } else
            xsltParseContentError(cctxt->style, child);
        } else
            xsltParseContentError(cctxt->style, child);
        }
        child = child->next;
    } while (child != NULL);
    }    
    goto exit;

call_template:
    /* <!-- Content: xsl:with-param* --> */
    if (elem->children != NULL) {
    xmlNodePtr child = elem->children;
    do {
        if (child->type == XML_ELEMENT_NODE) {
        if (IS_XSLT_ELEM_FAST(child)) {
            xsltStyleType type;

            type = xsltGetXSLTElementTypeByNode(cctxt, child);
            if (type == XSLT_FUNC_WITHPARAM) {
            cctxt->inode->curChildType = XSLT_FUNC_WITHPARAM;
            xsltParseAnyXSLTElem(cctxt, child);
            } else {
            xsltParseContentError(cctxt->style, child);
            }
        } else
            xsltParseContentError(cctxt->style, child);
        }
        child = child->next;
    } while (child != NULL);
    }    
    goto exit;

text:
    if (elem->children != NULL) {
    xmlNodePtr child = elem->children;
    do {
        if ((child->type != XML_TEXT_NODE) &&
        (child->type != XML_CDATA_SECTION_NODE))
        {
        xsltTransformError(NULL, cctxt->style, elem,
            "The XSLT 'text' element must have only character "
            "data as content.\n");
        }
        child = child->next;
    } while (child != NULL);
    }
    goto exit;

empty_content:
    if (elem->children != NULL) {
    xmlNodePtr child = elem->children;
    /*
    * Relaxed behaviour: we will allow whitespace-only text-nodes.
    */
    do {
        if (((child->type != XML_TEXT_NODE) &&
         (child->type != XML_CDATA_SECTION_NODE)) ||
        (! IS_BLANK_NODE(child)))
        {
        xsltTransformError(NULL, cctxt->style, elem,
            "This XSLT element must have no content.\n");
        cctxt->style->errors++;
        break;
        }
        child = child->next;
    } while (child != NULL);        
    }
    goto exit;

choose:
    /* <!-- Content: (xsl:when+, xsl:otherwise?) --> */
    /*
    * TODO: text-nodes in between are *not* allowed in XSLT 1.0.
    *   The old behaviour did not check this.
    * NOTE: In XSLT 2.0 they are stripped beforehand
    *  if whitespace-only (regardless of xml:space).
    */
    if (elem->children != NULL) {
    xmlNodePtr child = elem->children;
    int nbWhen = 0, nbOtherwise = 0, err = 0;
    do {
        if (child->type == XML_ELEMENT_NODE) {
        if (IS_XSLT_ELEM_FAST(child)) {
            xsltStyleType type;
        
            type = xsltGetXSLTElementTypeByNode(cctxt, child);
            if (type == XSLT_FUNC_WHEN) {
            nbWhen++;
            if (nbOtherwise) {
                xsltParseContentError(cctxt->style, child);
                err = 1;
                break;
            }
            cctxt->inode->curChildType = XSLT_FUNC_WHEN;
            xsltParseAnyXSLTElem(cctxt, child);
            } else if (type == XSLT_FUNC_OTHERWISE) {
            if (! nbWhen) {
                xsltParseContentError(cctxt->style, child);
                err = 1;
                break;
            }           
            if (nbOtherwise) {
                xsltTransformError(NULL, cctxt->style, elem,
                "The XSLT 'choose' element must not contain "
                "more than one XSLT 'otherwise' element.\n");
                cctxt->style->errors++;
                err = 1;
                break;
            }
            nbOtherwise++;
            cctxt->inode->curChildType = XSLT_FUNC_OTHERWISE;
            xsltParseAnyXSLTElem(cctxt, child);
            } else
            xsltParseContentError(cctxt->style, child);
        } else
            xsltParseContentError(cctxt->style, child);
        } 
        /*
        else
            xsltParseContentError(cctxt, child);
        */
        child = child->next;
    } while (child != NULL);
    if ((! err) && (! nbWhen)) {
        xsltTransformError(NULL, cctxt->style, elem,
        "The XSLT element 'choose' must contain at least one "
        "XSLT element 'when'.\n");
        cctxt->style->errors++;
    }   
    }    
    goto exit;

for_each:
    /* <!-- Content: (xsl:sort*, template) --> */
    /*
    * NOTE: Text-nodes before xsl:sort are *not* allowed in XSLT 1.0.
    *   The old behaviour did not allow this, but it catched this
    *   only at transformation-time.
    *   In XSLT 2.0 they are stripped beforehand if whitespace-only
    *   (regardless of xml:space).
    */
    if (elem->children != NULL) {
    xmlNodePtr child = elem->children;
    /*
    * Parse xsl:sort first.
    */
    do {        
        if ((child->type == XML_ELEMENT_NODE) &&
        IS_XSLT_ELEM_FAST(child))
        {       
        if (xsltGetXSLTElementTypeByNode(cctxt, child) ==
            XSLT_FUNC_SORT)
        {       
            cctxt->inode->curChildType = XSLT_FUNC_SORT;
            xsltParseAnyXSLTElem(cctxt, child);
        } else
            break;
        } else
        break;
        child = child->next;
    } while (child != NULL);
    /*
    * Parse the sequece constructor.
    */
    if (child != NULL)
        xsltParseSequenceConstructor(cctxt, child);
    }    
    goto exit;

sequence_constructor:
    /*
    * Parse the sequence constructor.
    */
    if (elem->children != NULL)
    xsltParseSequenceConstructor(cctxt, elem->children);

    /*
    * Register information for vars/params. Only needed if there
    * are any following siblings.
    */
    if ((elem->next != NULL) &&
    ((cctxt->inode->type == XSLT_FUNC_VARIABLE) ||
     (cctxt->inode->type == XSLT_FUNC_PARAM)))
    {   
    if ((elem->psvi != NULL) &&
        (((xsltStyleBasicItemVariablePtr) elem->psvi)->name))
    {   
        xsltCompilerVarInfoPush(cctxt, elem,
        ((xsltStyleBasicItemVariablePtr) elem->psvi)->name,
        ((xsltStyleBasicItemVariablePtr) elem->psvi)->ns);
    }
    }

error:
exit:
    xsltCompilerNodePop(cctxt, elem);
    return(0);

internal_err:
    xsltCompilerNodePop(cctxt, elem);
    return(-1);
}

static xsltStyleItemUknownPtr
xsltForwardsCompatUnkownItemCreate(xsltCompilerCtxtPtr cctxt)
{
    xsltStyleItemUknownPtr item;

    item = (xsltStyleItemUknownPtr) xmlMalloc(sizeof(xsltStyleItemUknown));
    if (item == NULL) {
    xsltTransformError(NULL, cctxt->style, NULL,
        "Internal error in xsltForwardsCompatUnkownItemCreate(): "
        "Failed to allocate memory.\n");
    cctxt->style->errors++;
    return(NULL);
    }
    memset(item, 0, sizeof(xsltStyleItemUknown));
    item->type = XSLT_FUNC_UNKOWN_FORWARDS_COMPAT;
    /*
    * Store it in the stylesheet.
    */
    item->next = cctxt->style->preComps;
    cctxt->style->preComps = (xsltElemPreCompPtr) item;
    return(item);
}

static int
xsltParseUnknownXSLTElem(xsltCompilerCtxtPtr cctxt,
                xmlNodePtr node)
{
    if ((cctxt == NULL) || (node == NULL))
    return(-1);

    /*
    * Detection of handled content of extension instructions.
    */
    if (cctxt->inode->category == XSLT_ELEMENT_CATEGORY_EXTENSION) {
    cctxt->inode->extContentHandled = 1;
    }    
    if (cctxt->inode->forwardsCompat == 0) {    
    /*
    * We are not in forwards-compatible mode, so raise an error.
    */
    xsltTransformError(NULL, cctxt->style, node,
        "Unknown XSLT element '%s'.\n", node->name);
    cctxt->style->errors++;
    return(1);
    }
    /*
    * Forwards-compatible mode.
    * ------------------------
    *    
    * Parse/compile xsl:fallback elements.
    *
    * QUESTION: Do we have to raise an error if there's no xsl:fallback?
    * ANSWER: No, since in the stylesheet the fallback behaviour might
    *  also be provided by using the XSLT function "element-available".
    */
    if (cctxt->unknownItem == NULL) {
    /*
    * Create a singleton for all unknown XSLT instructions.
    */
    cctxt->unknownItem = xsltForwardsCompatUnkownItemCreate(cctxt);
    if (cctxt->unknownItem == NULL) {
        node->psvi = NULL;
        return(-1);
    }
    }
    node->psvi = cctxt->unknownItem;
    if (node->children == NULL)
    return(0);
    else {
    xmlNodePtr child = node->children;

    xsltCompilerNodePush(cctxt, node);
    /*
    * Update the in-scope namespaces if needed.
    */
    if (node->nsDef != NULL)
        cctxt->inode->inScopeNs =
        xsltCompilerBuildInScopeNsList(cctxt, node);
    /*
    * Parse all xsl:fallback children.
    */
    do {
        if ((child->type == XML_ELEMENT_NODE) &&
        IS_XSLT_ELEM_FAST(child) &&
        IS_XSLT_NAME(child, "fallback"))
        {
        cctxt->inode->curChildType = XSLT_FUNC_FALLBACK;
        xsltParseAnyXSLTElem(cctxt, child);
        }
        child = child->next;
    } while (child != NULL);
    
    xsltCompilerNodePop(cctxt, node);
    }
    return(0);
}

void
xsltParseSequenceConstructor(xsltCompilerCtxtPtr cctxt, xmlNodePtr cur)
{
    xsltStyleType type;
    xmlNodePtr deleteNode = NULL;

    if (cctxt == NULL) {
    xmlGenericError(xmlGenericErrorContext,
        "xsltParseSequenceConstructor: Bad arguments\n");
    cctxt->style->errors++;
    return;
    }
    /*
    * Detection of handled content of extension instructions.
    */
    if (cctxt->inode->category == XSLT_ELEMENT_CATEGORY_EXTENSION) {
    cctxt->inode->extContentHandled = 1;
    }
    if (cur == NULL)
    return;
    /*
    * This is the content reffered to as a "template".
    * E.g. an xsl:element has such content model:
    * <xsl:element
    *   name = { qname }
    *   namespace = { uri-reference }
    *   use-attribute-sets = qnames>
    * <!-- Content: template -->
    *
    * NOTE that in XSLT-2 the term "template" was abandoned due to
    *  confusion with xsl:template and the term "sequence constructor"
    *  was introduced instead.
    *
    * The following XSLT-instructions are allowed to appear:
    *  xsl:apply-templates, xsl:call-template, xsl:apply-imports,
    *  xsl:for-each, xsl:value-of, xsl:copy-of, xsl:number,
    *  xsl:choose, xsl:if, xsl:text, xsl:copy, xsl:variable,
    *  xsl:message, xsl:fallback,
    *  xsl:processing-instruction, xsl:comment, xsl:element
    *  xsl:attribute. 
    * Additional allowed content:
    * 1) extension instructions
    * 2) literal result elements
    * 3) PCDATA
    *
    * NOTE that this content model does *not* allow xsl:param.
    */    
    while (cur != NULL) {
    if (deleteNode != NULL) {
#ifdef WITH_XSLT_DEBUG_BLANKS
        xsltGenericDebug(xsltGenericDebugContext,
         "xsltParseSequenceConstructor: removing xsl:text element\n");
#endif
        xmlUnlinkNode(deleteNode);
        xmlFreeNode(deleteNode);
        deleteNode = NULL;
    }
    if (cur->type == XML_ELEMENT_NODE) {        
        
        if (cur->psvi == xsltXSLTTextMarker) {
        /*
        * xsl:text elements
        * --------------------------------------------------------
        */
        xmlNodePtr tmp;

        cur->psvi = NULL;
        /*
        * Mark the xsl:text element for later deletion.
        */
        deleteNode = cur;
        /*
        * Validate content.
        */
        tmp = cur->children;
        if (tmp) {
            /*
            * We don't expect more than one text-node in the
            * content, since we already merged adjacent
            * text/CDATA-nodes and eliminated PI/comment-nodes.
            */
            if ((tmp->type == XML_TEXT_NODE) ||
            (tmp->next == NULL))
            {
            /*
            * Leave the contained text-node in the tree.
            */
            xmlUnlinkNode(tmp);
            xmlAddPrevSibling(cur, tmp);
            } else {
            tmp = NULL;
            xsltTransformError(NULL, cctxt->style, cur,
                "Element 'xsl:text': Invalid type "
                "of node found in content.\n");
            cctxt->style->errors++;
            } 
        }
        if (cur->properties) {
            xmlAttrPtr attr;
            /*
            * TODO: We need to report errors for
            *  invalid attrs.
            */
            attr = cur->properties;
            do {
            if ((attr->ns == NULL) &&
                (attr->name != NULL) &&
                (attr->name[0] == 'd') &&
                xmlStrEqual(attr->name,
                BAD_CAST "disable-output-escaping"))
            {
                /*
                * Attr "disable-output-escaping".
                * XSLT-2: This attribute is deprecated.
                */
                if ((attr->children != NULL) &&
                xmlStrEqual(attr->children->content,
                BAD_CAST "yes"))
                {
                /*
                * Disable output escaping for this
                * text node.
                */
                if (tmp)
                    tmp->name = xmlStringTextNoenc;
                } else if ((attr->children == NULL) ||
                (attr->children->content == NULL) ||
                (!xmlStrEqual(attr->children->content,
                BAD_CAST "no")))
                {
                xsltTransformError(NULL, cctxt->style,
                    cur,
                    "Attribute 'disable-output-escaping': "
                    "Invalid value. Expected is "
                    "'yes' or 'no'.\n");
                cctxt->style->errors++;
                }
                break;
            }
            attr = attr->next;
            } while (attr != NULL);
        }
        } else if (IS_XSLT_ELEM_FAST(cur)) {
        /*
        * TODO: Using the XSLT-marker is still not stable yet.
        */
        /* if (cur->psvi == xsltXSLTElemMarker) { */        
        /*
        * XSLT instructions
        * --------------------------------------------------------
        */
        cur->psvi = NULL;
        type = xsltGetXSLTElementTypeByNode(cctxt, cur);
        switch (type) {
            case XSLT_FUNC_APPLYIMPORTS:
            case XSLT_FUNC_APPLYTEMPLATES:
            case XSLT_FUNC_ATTRIBUTE:
            case XSLT_FUNC_CALLTEMPLATE:
            case XSLT_FUNC_CHOOSE:
            case XSLT_FUNC_COMMENT:
            case XSLT_FUNC_COPY:
            case XSLT_FUNC_COPYOF:
            case XSLT_FUNC_DOCUMENT: /* Extra one */
            case XSLT_FUNC_ELEMENT:
            case XSLT_FUNC_FALLBACK:
            case XSLT_FUNC_FOREACH:
            case XSLT_FUNC_IF:
            case XSLT_FUNC_MESSAGE:
            case XSLT_FUNC_NUMBER:
            case XSLT_FUNC_PI:
            case XSLT_FUNC_TEXT:
            case XSLT_FUNC_VALUEOF:
            case XSLT_FUNC_VARIABLE:
            /*
            * Parse the XSLT element.
            */
            cctxt->inode->curChildType = type;
            xsltParseAnyXSLTElem(cctxt, cur);
            break;
            default:
            xsltParseUnknownXSLTElem(cctxt, cur);           
            cur = cur->next;
            continue;
        }
        } else {
        /*
        * Non-XSLT elements
        * -----------------
        */
        xsltCompilerNodePush(cctxt, cur);
        /*
        * Update the in-scope namespaces if needed.
        */
        if (cur->nsDef != NULL)
            cctxt->inode->inScopeNs =
            xsltCompilerBuildInScopeNsList(cctxt, cur);
        /*
        * The current element is either a literal result element
        * or an extension instruction.
        *
        * Process attr "xsl:extension-element-prefixes".
        * FUTURE TODO: IIRC in XSLT 2.0 this attribute must be
        * processed by the implementor of the extension function;
        * i.e., it won't be handled by the XSLT processor.
        */
        /* SPEC 1.0:
        *   "exclude-result-prefixes" is only allowed on literal
        *   result elements and "xsl:exclude-result-prefixes"
        *   on xsl:stylesheet/xsl:transform.
        * SPEC 2.0:
        *   "There are a number of standard attributes
        *   that may appear on any XSLT element: specifically
        *   version, exclude-result-prefixes,
        *   extension-element-prefixes, xpath-default-namespace,
        *   default-collation, and use-when."
        *
        * SPEC 2.0:
        *   For literal result elements:
        *   "xsl:version, xsl:exclude-result-prefixes,
        *    xsl:extension-element-prefixes,
        *    xsl:xpath-default-namespace,
        *    xsl:default-collation, or xsl:use-when."
        */
        if (cur->properties)
            cctxt->inode->extElemNs =
            xsltParseExtElemPrefixes(cctxt,
                cur, cctxt->inode->extElemNs,
                XSLT_ELEMENT_CATEGORY_LRE);
        /*
        * Eval if we have an extension instruction here.
        */
        if ((cur->ns != NULL) &&
            (cctxt->inode->extElemNs != NULL) &&
            (xsltCheckExtPrefix(cctxt->style, cur->ns->href) == 1))
        {
            /*
            * Extension instructions
            * ----------------------------------------------------
            * Mark the node information.
            */
            cctxt->inode->category = XSLT_ELEMENT_CATEGORY_EXTENSION;
            cctxt->inode->extContentHandled = 0;
            if (cur->psvi != NULL) {
            cur->psvi = NULL;
            /*
            * TODO: Temporary sanity check.
            */
            xsltTransformError(NULL, cctxt->style, cur,
                "Internal error in xsltParseSequenceConstructor(): "
                "Occupied PSVI field.\n");
            cctxt->style->errors++;
            cur = cur->next;
            continue;
            }
            cur->psvi = (void *)
            xsltPreComputeExtModuleElement(cctxt->style, cur);
            
            if (cur->psvi == NULL) {
            /*
            * OLD COMMENT: "Unknown element, maybe registered
            *  at the context level. Mark it for later
            *  recognition."
            * QUESTION: What does the xsltExtMarker mean?
            *  ANSWER: It is used in
            *   xsltApplySequenceConstructor() at
            *   transformation-time to look out for extension
            *   registered in the transformation context.
            */
            cur->psvi = (void *) xsltExtMarker;
            }
            /*
            * BIG NOTE: Now the ugly part. In previous versions
            *  of Libxslt (until 1.1.16), all the content of an
            *  extension instruction was processed and compiled without
            *  the need of the extension-author to explicitely call
            *  such a processing;.We now need to mimic this old
            *  behaviour in order to avoid breaking old code
            *  on the extension-author's side.
            * The mechanism:
            *  1) If the author does *not* set the
            *    compile-time-flag @extContentHandled, then we'll
            *    parse the content assuming that it's a "template"
            *    (or "sequence constructor in XSLT 2.0 terms).
            *    NOTE: If the extension is registered at
            *    transformation-time only, then there's no way of
            *    knowing that content shall be valid, and we'll
            *    process the content the same way.
            *  2) If the author *does* set the flag, then we'll assume
            *   that the author has handled the parsing him/herself
            *   (e.g. called xsltParseSequenceConstructor(), etc.
            *   explicitely in his/her code).
            */
            if ((cur->children != NULL) &&
            (cctxt->inode->extContentHandled == 0))
            {
            /*
            * Default parsing of the content using the
            * sequence-constructor model.
            */
            xsltParseSequenceConstructor(cctxt, cur->children);
            }
        } else {
            /*
            * Literal result element
            * ----------------------------------------------------
            * Allowed XSLT attributes:
            *  xsl:extension-element-prefixes CDATA #IMPLIED
            *  xsl:exclude-result-prefixes CDATA #IMPLIED
            *  TODO: xsl:use-attribute-sets %qnames; #IMPLIED
            *  xsl:version NMTOKEN #IMPLIED
            */
            cur->psvi = NULL;
            cctxt->inode->category = XSLT_ELEMENT_CATEGORY_LRE;
            if (cur->properties != NULL) {
            xmlAttrPtr attr = cur->properties;
            /*
            * Attribute "xsl:exclude-result-prefixes".
            */
            cctxt->inode->exclResultNs =
                xsltParseExclResultPrefixes(cctxt, cur,
                cctxt->inode->exclResultNs,
                XSLT_ELEMENT_CATEGORY_LRE);
            /*
            * Attribute "xsl:version".
            */
            xsltParseAttrXSLTVersion(cctxt, cur,
                XSLT_ELEMENT_CATEGORY_LRE);
            /*
            * Report invalid XSLT attributes.           
            * For XSLT 1.0 only xsl:use-attribute-sets is allowed
            * next to xsl:version, xsl:exclude-result-prefixes and
            * xsl:extension-element-prefixes.
            *
            * Mark all XSLT attributes, in order to skip such
            * attributes when instantiating the LRE.
            */
            do {
                if ((attr->psvi != xsltXSLTAttrMarker) &&
                IS_XSLT_ATTR_FAST(attr))
                {                   
                if (! xmlStrEqual(attr->name,
                    BAD_CAST "use-attribute-sets"))
                {               
                    xsltTransformError(NULL, cctxt->style,
                    cur,
                    "Unknown XSLT attribute '%s'.\n",
                    attr->name);
                    cctxt->style->errors++;
                } else {
                    /*
                    * XSLT attr marker.
                    */
                    attr->psvi = (void *) xsltXSLTAttrMarker;
                }
                }
                attr = attr->next;
            } while (attr != NULL);
            }
            /*
            * Create/reuse info for the literal result element.
            */
            if (cctxt->inode->nsChanged)
            xsltLREInfoCreate(cctxt, cur, 1);
            cur->psvi = cctxt->inode->litResElemInfo;
            /*
            * Apply ns-aliasing on the element and on its attributes.
            */
            if (cctxt->hasNsAliases)
            xsltLREBuildEffectiveNs(cctxt, cur);
            /*
            * Compile attribute value templates (AVT).
            */
            if (cur->properties) {
            xmlAttrPtr attr = cur->properties;
            
            while (attr != NULL) {
                xsltCompileAttr(cctxt->style, attr);
                attr = attr->next;
            }
            }
            /*
            * Parse the content, which is defined to be a "template"
            * (or "sequence constructor" in XSLT 2.0 terms).
            */
            if (cur->children != NULL) {
            xsltParseSequenceConstructor(cctxt, cur->children);
            }
        }
        /*
        * Leave the non-XSLT element.
        */
        xsltCompilerNodePop(cctxt, cur);
        }
    }
    cur = cur->next;
    }
    if (deleteNode != NULL) {
#ifdef WITH_XSLT_DEBUG_BLANKS
    xsltGenericDebug(xsltGenericDebugContext,
        "xsltParseSequenceConstructor: removing xsl:text element\n");
#endif
    xmlUnlinkNode(deleteNode);
    xmlFreeNode(deleteNode);
    deleteNode = NULL;
    }
}

void
xsltParseTemplateContent(xsltStylesheetPtr style, xmlNodePtr templ) {
    if ((style == NULL) || (templ == NULL))
    return;

    /*
    * Detection of handled content of extension instructions.
    */
    if (XSLT_CCTXT(style)->inode->category == XSLT_ELEMENT_CATEGORY_EXTENSION) {
    XSLT_CCTXT(style)->inode->extContentHandled = 1;
    }

    if (templ->children != NULL) {  
    xmlNodePtr child = templ->children;
    /*
    * Process xsl:param elements, which can only occur as the
    * immediate children of xsl:template (well, and of any
    * user-defined extension instruction if needed).
    */  
    do {
        if ((child->type == XML_ELEMENT_NODE) &&
        IS_XSLT_ELEM_FAST(child) &&
        IS_XSLT_NAME(child, "param"))
        {
        XSLT_CCTXT(style)->inode->curChildType = XSLT_FUNC_PARAM;
        xsltParseAnyXSLTElem(XSLT_CCTXT(style), child);
        } else
        break;
        child = child->next;
    } while (child != NULL);
    /*
    * Parse the content and register the pattern.
    */
    xsltParseSequenceConstructor(XSLT_CCTXT(style), child);
    }
}

#else /* XSLT_REFACTORED */

void
xsltParseTemplateContent(xsltStylesheetPtr style, xmlNodePtr templ) {
    xmlNodePtr cur, delete;
    /*
     * This content comes from the stylesheet
     * For stylesheets, the set of whitespace-preserving
     * element names consists of just xsl:text.
     */
    cur = templ->children;
    delete = NULL;
    while (cur != NULL) {
    if (delete != NULL) {
#ifdef WITH_XSLT_DEBUG_BLANKS
        xsltGenericDebug(xsltGenericDebugContext,
         "xsltParseTemplateContent: removing text\n");
#endif
        xmlUnlinkNode(delete);
        xmlFreeNode(delete);
        delete = NULL;
    }
    if (IS_XSLT_ELEM(cur)) {
        if (IS_XSLT_NAME(cur, "text")) {
        /*
        * TODO: Processing of xsl:text should be moved to
        *   xsltPrecomputeStylesheet(), since otherwise this
        *   will be performed for every multiply included
        *   stylesheet; i.e. this here is not skipped with
        *   the use of the style->nopreproc flag.
        */
        if (cur->children != NULL) {
            xmlChar *prop;
            xmlNodePtr text = cur->children, next;
            int noesc = 0;
            
            prop = xmlGetNsProp(cur,
            (const xmlChar *)"disable-output-escaping",
            NULL);
            if (prop != NULL) {
#ifdef WITH_XSLT_DEBUG_PARSING
            xsltGenericDebug(xsltGenericDebugContext,
                 "Disable escaping: %s\n", text->content);
#endif
            if (xmlStrEqual(prop, (const xmlChar *)"yes")) {
                noesc = 1;
            } else if (!xmlStrEqual(prop,
                        (const xmlChar *)"no")){
                xsltTransformError(NULL, style, cur,
         "xsl:text: disable-output-escaping allows only yes or no\n");
                style->warnings++;

            }
            xmlFree(prop);
            }

            while (text != NULL) {
            if (text->type == XML_COMMENT_NODE) {
                text = text->next;
                continue;
            }
            if ((text->type != XML_TEXT_NODE) &&
                 (text->type != XML_CDATA_SECTION_NODE)) {
                xsltTransformError(NULL, style, cur,
         "xsltParseTemplateContent: xslt:text content problem\n");
                style->errors++;
                break;
            }
            if ((noesc) && (text->type != XML_CDATA_SECTION_NODE))
                text->name = xmlStringTextNoenc;
            text = text->next;
            }

            /*
             * replace xsl:text by the list of childs
             */
            if (text == NULL) {
            text = cur->children;
            while (text != NULL) {
                if ((style->internalized) &&
                    (text->content != NULL) &&
                    (!xmlDictOwns(style->dict, text->content))) {

                /*
                 * internalize the text string
                 */
                if (text->doc->dict != NULL) {
                    const xmlChar *tmp;
                    
                    tmp = xmlDictLookup(text->doc->dict,
                                        text->content, -1);
                    if (tmp != text->content) {
                        xmlNodeSetContent(text, NULL);
                    text->content = (xmlChar *) tmp;
                    }
                }
                }

                next = text->next;
                xmlUnlinkNode(text);
                xmlAddPrevSibling(cur, text);
                text = next;
            }
            }
        }
        delete = cur;
        goto skip_children;
        }
    }
    else if ((cur->ns != NULL) && (style->nsDefs != NULL) &&
        (xsltCheckExtPrefix(style, cur->ns->prefix)))
    {
        /*
         * okay this is an extension element compile it too
         */
        xsltStylePreCompute(style, cur);
    }
    else if (cur->type == XML_ELEMENT_NODE)
    {
        /*
         * This is an element which will be output as part of the
         * template exectution, precompile AVT if found.
         */
        if ((cur->ns == NULL) && (style->defaultAlias != NULL)) {
        cur->ns = xmlSearchNsByHref(cur->doc, cur,
            style->defaultAlias);
        }
        if (cur->properties != NULL) {
            xmlAttrPtr attr = cur->properties;

        while (attr != NULL) {
            xsltCompileAttr(style, attr);
            attr = attr->next;
        }
        }
    }
    /*
     * Skip to next node
     */
    if (cur->children != NULL) {
        if (cur->children->type != XML_ENTITY_DECL) {
        cur = cur->children;
        continue;
        }
    }
skip_children:
    if (cur->next != NULL) {
        cur = cur->next;
        continue;
    }
    
    do {
        cur = cur->parent;
        if (cur == NULL)
        break;
        if (cur == templ) {
        cur = NULL;
        break;
        }
        if (cur->next != NULL) {
        cur = cur->next;
        break;
        }
    } while (cur != NULL);
    }
    if (delete != NULL) {
#ifdef WITH_XSLT_DEBUG_PARSING
    xsltGenericDebug(xsltGenericDebugContext,
     "xsltParseTemplateContent: removing text\n");
#endif
    xmlUnlinkNode(delete);
    xmlFreeNode(delete);
    delete = NULL;
    }

    /*
     * Skip the first params
     */
    cur = templ->children;
    while (cur != NULL) {
    if ((IS_XSLT_ELEM(cur)) && (!(IS_XSLT_NAME(cur, "param"))))
        break;
    cur = cur->next;
    }

    /*
     * Browse the remainder of the template
     */
    while (cur != NULL) {
    if ((IS_XSLT_ELEM(cur)) && (IS_XSLT_NAME(cur, "param"))) {
        xmlNodePtr param = cur;

        xsltTransformError(NULL, style, cur,
        "xsltParseTemplateContent: ignoring misplaced param element\n");
        if (style != NULL) style->warnings++;
            cur = cur->next;
        xmlUnlinkNode(param);
        xmlFreeNode(param);
    } else
        break;
    }
}

#endif /* else XSLT_REFACTORED */

static void
xsltParseStylesheetKey(xsltStylesheetPtr style, xmlNodePtr key) {
    xmlChar *prop = NULL;
    xmlChar *use = NULL;
    xmlChar *match = NULL;
    xmlChar *name = NULL;
    xmlChar *nameURI = NULL;

    if ((style == NULL) || (key == NULL))
    return;

    /*
     * Get arguments
     */
    prop = xmlGetNsProp(key, (const xmlChar *)"name", NULL);
    if (prop != NULL) {
        const xmlChar *URI;

    /*
    * TODO: Don't use xsltGetQNameURI().
    */
    URI = xsltGetQNameURI(key, &prop);
    if (prop == NULL) {
        if (style != NULL) style->errors++;
        goto error;
    } else {
        name = prop;
        if (URI != NULL)
        nameURI = xmlStrdup(URI);
    }
#ifdef WITH_XSLT_DEBUG_PARSING
    xsltGenericDebug(xsltGenericDebugContext,
         "xsltParseStylesheetKey: name %s\n", name);
#endif
    } else {
    xsltTransformError(NULL, style, key,
        "xsl:key : error missing name\n");
    if (style != NULL) style->errors++;
    goto error;
    }

    match = xmlGetNsProp(key, (const xmlChar *)"match", NULL);
    if (match == NULL) {
    xsltTransformError(NULL, style, key,
        "xsl:key : error missing match\n");
    if (style != NULL) style->errors++;
    goto error;
    }

    use = xmlGetNsProp(key, (const xmlChar *)"use", NULL);
    if (use == NULL) {
    xsltTransformError(NULL, style, key,
        "xsl:key : error missing use\n");
    if (style != NULL) style->errors++;
    goto error;
    }

    /*
     * register the keys
     */
    xsltAddKey(style, name, nameURI, match, use, key);


error:
    if (use != NULL)
    xmlFree(use);
    if (match != NULL)
    xmlFree(match);
    if (name != NULL)
    xmlFree(name);
    if (nameURI != NULL)
    xmlFree(nameURI);

    if (key->children != NULL) {
    xsltParseContentError(style, key->children);
    }
}

#ifdef XSLT_REFACTORED

static void
xsltParseXSLTTemplate(xsltCompilerCtxtPtr cctxt, xmlNodePtr templNode) {
    xsltTemplatePtr templ;
    xmlChar *prop;    
    double  priority;    

    if ((cctxt == NULL) || (templNode == NULL))
    return;

    /*
     * Create and link the structure
     */
    templ = xsltNewTemplate();
    if (templ == NULL)
    return;

    xsltCompilerNodePush(cctxt, templNode);
    if (templNode->nsDef != NULL)
    cctxt->inode->inScopeNs =
        xsltCompilerBuildInScopeNsList(cctxt, templNode);

    templ->next = cctxt->style->templates;
    cctxt->style->templates = templ;
    templ->style = cctxt->style;  

    /*
    * Attribute "mode".
    */
    prop = xmlGetNsProp(templNode, (const xmlChar *)"mode", NULL);
    if (prop != NULL) { 
        const xmlChar *modeURI;

    /*
    * TODO: We need a standardized function for extraction
    *  of namespace names and local names from QNames.
    *  Don't use xsltGetQNameURI() as it cannot channeö
    *  reports through the context.
    */
    modeURI = xsltGetQNameURI(templNode, &prop);
    if (prop == NULL) {
        cctxt->style->errors++;
        goto error;
    }
    templ->mode = xmlDictLookup(cctxt->style->dict, prop, -1);
    xmlFree(prop);
    prop = NULL;
    if (xmlValidateNCName(templ->mode, 0)) {
        xsltTransformError(NULL, cctxt->style, templNode,
        "xsl:template: Attribute 'mode': The local part '%s' "
        "of the value is not a valid NCName.\n", templ->name);
        cctxt->style->errors++;
        goto error;
    }
    if (modeURI != NULL)
        templ->modeURI = xmlDictLookup(cctxt->style->dict, modeURI, -1);
#ifdef WITH_XSLT_DEBUG_PARSING
    xsltGenericDebug(xsltGenericDebugContext,
         "xsltParseXSLTTemplate: mode %s\n", templ->mode);
#endif
    }
    /*
    * Attribute "match".
    */
    prop = xmlGetNsProp(templNode, (const xmlChar *)"match", NULL);
    if (prop != NULL) {
    templ->match  = prop;
    prop = NULL;
    }
    /*
    * Attribute "priority".
    */
    prop = xmlGetNsProp(templNode, (const xmlChar *)"priority", NULL);
    if (prop != NULL) {
    priority = xmlXPathStringEvalNumber(prop);
    templ->priority = (float) priority;
    xmlFree(prop);
    prop = NULL;
    }
    /*
    * Attribute "name".
    */
    prop = xmlGetNsProp(templNode, (const xmlChar *)"name", NULL);
    if (prop != NULL) {
        const xmlChar *nameURI;
    xsltTemplatePtr curTempl;
    
    /*
    * TODO: Don't use xsltGetQNameURI().
    */
    nameURI = xsltGetQNameURI(templNode, &prop);
    if (prop == NULL) {
        cctxt->style->errors++;
        goto error;
    }
    templ->name = xmlDictLookup(cctxt->style->dict, prop, -1);
    xmlFree(prop);
    prop = NULL;
    if (xmlValidateNCName(templ->name, 0)) {
        xsltTransformError(NULL, cctxt->style, templNode,
        "xsl:template: Attribute 'name': The local part '%s' of "
        "the value is not a valid NCName.\n", templ->name);
        cctxt->style->errors++;
        goto error;
    }   
    if (nameURI != NULL)
        templ->nameURI = xmlDictLookup(cctxt->style->dict, nameURI, -1);
    curTempl = templ->next;
    while (curTempl != NULL) {
        if ((nameURI != NULL && xmlStrEqual(curTempl->name, templ->name) &&
        xmlStrEqual(curTempl->nameURI, nameURI) ) ||
        (nameURI == NULL && curTempl->nameURI == NULL &&
        xmlStrEqual(curTempl->name, templ->name)))
        {
        xsltTransformError(NULL, cctxt->style, templNode,
            "xsl:template: error duplicate name '%s'\n", templ->name);
        cctxt->style->errors++;
        goto error;
        }
        curTempl = curTempl->next;
    }
    }
    if (templNode->children != NULL) {
    xsltParseTemplateContent(cctxt->style, templNode);  
    /*
    * MAYBE TODO: Custom behaviour: In order to stay compatible with
    * Xalan and MSXML(.NET), we could allow whitespace
    * to appear before an xml:param element; this whitespace
    * will additionally become part of the "template".
    * NOTE that this is totally deviates from the spec, but
    * is the de facto behaviour of Xalan and MSXML(.NET).
    * Personally I wouldn't allow this, since if we have:
    * <xsl:template ...xml:space="preserve">
    *   <xsl:param name="foo"/>
    *   <xsl:param name="bar"/>
    *   <xsl:param name="zoo"/>
    * ... the whitespace between every xsl:param would be
    * added to the result tree.
    */      
    }    
    
    templ->elem = templNode;
    templ->content = templNode->children;
    xsltAddTemplate(cctxt->style, templ, templ->mode, templ->modeURI);

error:
    xsltCompilerNodePop(cctxt, templNode);
    return;
}

#else /* XSLT_REFACTORED */

static void
xsltParseStylesheetTemplate(xsltStylesheetPtr style, xmlNodePtr template) {
    xsltTemplatePtr ret;
    xmlChar *prop;
    xmlChar *mode = NULL;
    xmlChar *modeURI = NULL;
    double  priority;

    if (template == NULL)
    return;

    /*
     * Create and link the structure
     */
    ret = xsltNewTemplate();
    if (ret == NULL)
    return;
    ret->next = style->templates;
    style->templates = ret;
    ret->style = style;
   
    /*
     * Get inherited namespaces
     */
    /*
    * TODO: Apply the optimized in-scope-namespace mechanism
    *   as for the other XSLT instructions.
    */
    xsltGetInheritedNsList(style, ret, template);

    /*
     * Get arguments
     */
    prop = xmlGetNsProp(template, (const xmlChar *)"mode", NULL);
    if (prop != NULL) {
        const xmlChar *URI;

    /*
    * TODO: Don't use xsltGetQNameURI().
    */
    URI = xsltGetQNameURI(template, &prop);
    if (prop == NULL) {
        if (style != NULL) style->errors++;
        goto error;
    } else {
        mode = prop;
        if (URI != NULL)
        modeURI = xmlStrdup(URI);
    }
    ret->mode = xmlDictLookup(style->dict, mode, -1);
    ret->modeURI = xmlDictLookup(style->dict, modeURI, -1);
#ifdef WITH_XSLT_DEBUG_PARSING
    xsltGenericDebug(xsltGenericDebugContext,
         "xsltParseStylesheetTemplate: mode %s\n", mode);
#endif
        if (mode != NULL) xmlFree(mode);
    if (modeURI != NULL) xmlFree(modeURI);
    }
    prop = xmlGetNsProp(template, (const xmlChar *)"match", NULL);
    if (prop != NULL) {
    if (ret->match != NULL) xmlFree(ret->match);
    ret->match  = prop;
    }

    prop = xmlGetNsProp(template, (const xmlChar *)"priority", NULL);
    if (prop != NULL) {
    priority = xmlXPathStringEvalNumber(prop);
    ret->priority = (float) priority;
    xmlFree(prop);
    }

    prop = xmlGetNsProp(template, (const xmlChar *)"name", NULL);
    if (prop != NULL) {
        const xmlChar *URI;
    xsltTemplatePtr cur;
    
    /*
    * TODO: Don't use xsltGetQNameURI().
    */
    URI = xsltGetQNameURI(template, &prop);
    if (prop == NULL) {
        if (style != NULL) style->errors++;
        goto error;
    } else {
        if (xmlValidateNCName(prop,0)) {
            xsltTransformError(NULL, style, template,
                "xsl:template : error invalid name '%s'\n", prop);
        if (style != NULL) style->errors++;
        goto error;
        }
        ret->name = xmlDictLookup(style->dict, BAD_CAST prop, -1);
        xmlFree(prop);
        prop = NULL;
        if (URI != NULL)
        ret->nameURI = xmlDictLookup(style->dict, BAD_CAST URI, -1);
        else
        ret->nameURI = NULL;
        cur = ret->next;
        while (cur != NULL) {
            if ((URI != NULL && xmlStrEqual(cur->name, ret->name) &&
                xmlStrEqual(cur->nameURI, URI) ) ||
            (URI == NULL && cur->nameURI == NULL &&
                xmlStrEqual(cur->name, ret->name))) {
            xsltTransformError(NULL, style, template,
                "xsl:template: error duplicate name '%s'\n", ret->name);
            style->errors++;
            goto error;
        }
        cur = cur->next;
        }
    }
    }

    /*
     * parse the content and register the pattern
     */
    xsltParseTemplateContent(style, template);
    ret->elem = template;
    ret->content = template->children;
    xsltAddTemplate(style, ret, ret->mode, ret->modeURI);

error:
    return;
}

#endif /* else XSLT_REFACTORED */

#ifdef XSLT_REFACTORED

static xsltStyleItemIncludePtr
xsltCompileXSLTIncludeElem(xsltCompilerCtxtPtr cctxt, xmlNodePtr node) {
    xsltStyleItemIncludePtr item;

    if ((cctxt == NULL) || (node == NULL))
    return(NULL);

    node->psvi = NULL;
    item = (xsltStyleItemIncludePtr) xmlMalloc(sizeof(xsltStyleItemInclude));
    if (item == NULL) {
    xsltTransformError(NULL, cctxt->style, node,
        "xsltIncludeComp : malloc failed\n");
    cctxt->style->errors++;
    return(NULL);
    }
    memset(item, 0, sizeof(xsltStyleItemInclude));

    node->psvi = item;
    item->inst = node;
    item->type = XSLT_FUNC_INCLUDE;

    item->next = cctxt->style->preComps;
    cctxt->style->preComps = (xsltElemPreCompPtr) item;

    return(item);
}

static int
xsltParseFindTopLevelElem(xsltCompilerCtxtPtr cctxt,
                  xmlNodePtr cur,
                  const xmlChar *name,
                  const xmlChar *namespaceURI,
                  int breakOnOtherElem,               
                  xmlNodePtr *resultNode)
{
    if (name == NULL)
    return(-1);

    *resultNode = NULL;
    while (cur != NULL) {
    if (cur->type == XML_ELEMENT_NODE) {
        if ((cur->ns != NULL) && (cur->name != NULL)) {
        if ((*(cur->name) == *name) &&
            xmlStrEqual(cur->name, name) &&
            xmlStrEqual(cur->ns->href, namespaceURI))           
        {
            *resultNode = cur;
            return(1);
        }
        }
        if (breakOnOtherElem)
        break;
    }
    cur = cur->next;
    }
    *resultNode = cur;
    return(0);
}

static int
xsltParseTopLevelXSLTElem(xsltCompilerCtxtPtr cctxt,
              xmlNodePtr node,
              xsltStyleType type)
{
    int ret = 0;

    /*
    * TODO: The reason why this function exists:
    *  due to historical reasons some of the
    *  top-level declarations are processed by functions
    *  in other files. Since we need still to set
    *  up the node-info and generate information like
    *  in-scope namespaces, this is a wrapper around
    *  those old parsing functions.
    */
    xsltCompilerNodePush(cctxt, node);
    if (node->nsDef != NULL)
    cctxt->inode->inScopeNs =
        xsltCompilerBuildInScopeNsList(cctxt, node);
    cctxt->inode->type = type;

    switch (type) {
    case XSLT_FUNC_INCLUDE:
        {
        int oldIsInclude;

        if (xsltCompileXSLTIncludeElem(cctxt, node) == NULL)
            goto exit;      
        /*
        * Mark this stylesheet tree as being currently included.
        */
        oldIsInclude = cctxt->isInclude;
        cctxt->isInclude = 1;
                        
        if (xsltParseStylesheetInclude(cctxt->style, node) != 0) {
            cctxt->style->errors++;
        }
        cctxt->isInclude = oldIsInclude;
        }
        break;
    case XSLT_FUNC_PARAM:
        xsltStylePreCompute(cctxt->style, node);
        xsltParseGlobalParam(cctxt->style, node);
        break;
    case XSLT_FUNC_VARIABLE:
        xsltStylePreCompute(cctxt->style, node);
        xsltParseGlobalVariable(cctxt->style, node);
        break;
    case XSLT_FUNC_ATTRSET:
        xsltParseStylesheetAttributeSet(cctxt->style, node);
        break;
    default:
        xsltTransformError(NULL, cctxt->style, node,
        "Internal error: (xsltParseTopLevelXSLTElem) "
        "Cannot handle this top-level declaration.\n");
        cctxt->style->errors++;
        ret = -1;
    }

exit:
    xsltCompilerNodePop(cctxt, node);

    return(ret);
}

#if 0
static int
xsltParseRemoveWhitespace(xmlNodePtr node)
{
    if ((node == NULL) || (node->children == NULL))
    return(0);
    else {
    xmlNodePtr delNode = NULL, child = node->children;

    do {
        if (delNode) {
        xmlUnlinkNode(delNode);
        xmlFreeNode(delNode);
        delNode = NULL;
        }
        if (((child->type == XML_TEXT_NODE) ||
         (child->type == XML_CDATA_SECTION_NODE)) &&
        (IS_BLANK_NODE(child)))
        delNode = child;        
        child = child->next;
    } while (child != NULL);
    if (delNode) {
        xmlUnlinkNode(delNode);
        xmlFreeNode(delNode);
        delNode = NULL;
    }
    }
    return(0);
}
#endif

static int
xsltParseXSLTStylesheetElemCore(xsltCompilerCtxtPtr cctxt, xmlNodePtr node)
{
#ifdef WITH_XSLT_DEBUG_PARSING
    int templates = 0;
#endif
    xmlNodePtr cur, start = NULL;
    xsltStylesheetPtr style;

    if ((cctxt == NULL) || (node == NULL) ||
    (node->type != XML_ELEMENT_NODE))
    return(-1);    

    style = cctxt->style;    
    /*
    * At this stage all import declarations of all stylesheet modules
    * with the same stylesheet level have been processed.
    * Now we can safely parse the rest of the declarations.
    */
    if (IS_XSLT_ELEM_FAST(node) && IS_XSLT_NAME(node, "include"))
    {
    xsltDocumentPtr include;
    /*
    * URGENT TODO: Make this work with simplified stylesheets!
    *   I.e., when we won't find an xsl:stylesheet element.
    */
    /*
    * This is as include declaration.
    */
    include = ((xsltStyleItemIncludePtr) node->psvi)->include;
    if (include == NULL) {
        /* TODO: raise error? */
        return(-1);
    }
    /*
    * TODO: Actually an xsl:include should locate an embedded
    *  stylesheet as well; so the document-element won't always
    *  be the element where the actual stylesheet is rooted at.
    *  But such embedded stylesheets are not supported by Libxslt yet.
    */
    node = xmlDocGetRootElement(include->doc);
    if (node == NULL) {
        return(-1);
    }
    }    
    
    if (node->children == NULL)
    return(0);
    /*
    * Push the xsl:stylesheet/xsl:transform element.
    */  
    xsltCompilerNodePush(cctxt, node);
    cctxt->inode->isRoot = 1;
    cctxt->inode->nsChanged = 0;
    /*
    * Start with the naked dummy info for literal result elements.
    */
    cctxt->inode->litResElemInfo = cctxt->inodeList->litResElemInfo;

    /*
    * In every case, we need to have
    * the in-scope namespaces of the element, where the
    * stylesheet is rooted at, regardless if it's an XSLT
    * instruction or a literal result instruction (or if
    * this is an embedded stylesheet).
    */      
    cctxt->inode->inScopeNs =
    xsltCompilerBuildInScopeNsList(cctxt, node);

    /*
    * Process attributes of xsl:stylesheet/xsl:transform.
    * --------------------------------------------------
    * Allowed are:
    *  id = id
    *  extension-element-prefixes = tokens
    *  exclude-result-prefixes = tokens
    *  version = number (mandatory)    
    */
    if (xsltParseAttrXSLTVersion(cctxt, node,
    XSLT_ELEMENT_CATEGORY_XSLT) == 0)
    {    
    /*
    * Attribute "version".
    * XSLT 1.0: "An xsl:stylesheet element *must* have a version
    *  attribute, indicating the version of XSLT that the
    *  stylesheet requires".
    * The root element of a simplified stylesheet must also have
    * this attribute.
    */
#ifdef XSLT_REFACTORED_MANDATORY_VERSION
    if (isXsltElem)
        xsltTransformError(NULL, cctxt->style, node,
        "The attribute 'version' is missing.\n");
    cctxt->style->errors++; 
#else
    /* OLD behaviour. */
    xsltTransformError(NULL, cctxt->style, node,
        "xsl:version is missing: document may not be a stylesheet\n");
    cctxt->style->warnings++;
#endif
    }    
    /*
    * The namespaces declared by the attributes
    *  "extension-element-prefixes" and
    *  "exclude-result-prefixes" are local to *this*
    *  stylesheet tree; i.e., they are *not* visible to
    *  other stylesheet-modules, whether imported or included.
    * 
    * Attribute "extension-element-prefixes".
    */
    cctxt->inode->extElemNs =
    xsltParseExtElemPrefixes(cctxt, node, NULL,
        XSLT_ELEMENT_CATEGORY_XSLT);
    /*
    * Attribute "exclude-result-prefixes".
    */
    cctxt->inode->exclResultNs =
    xsltParseExclResultPrefixes(cctxt, node, NULL,
        XSLT_ELEMENT_CATEGORY_XSLT);
    /*
    * Create/reuse info for the literal result element.
    */
    if (cctxt->inode->nsChanged)
    xsltLREInfoCreate(cctxt, node, 0);
    /*
    * Processed top-level elements:
    * ----------------------------
    *  xsl:variable, xsl:param (QName, in-scope ns,
    *    expression (vars allowed))
    *  xsl:attribute-set (QName, in-scope ns)
    *  xsl:strip-space, xsl:preserve-space (XPath NameTests,
    *    in-scope ns)
    *    I *think* global scope, merge with includes
    *  xsl:output (QName, in-scope ns)
    *  xsl:key (QName, in-scope ns, pattern,
    *    expression (vars *not* allowed))
    *  xsl:decimal-format (QName, needs in-scope ns)
    *  xsl:namespace-alias (in-scope ns)
    *    global scope, merge with includes
    *  xsl:template (last, QName, pattern)
    *
    * (whitespace-only text-nodes have *not* been removed
    *  yet; this will be done in xsltParseSequenceConstructor)
    *
    * Report misplaced child-nodes first.
    */
    cur = node->children;
    while (cur != NULL) {
    if (cur->type == XML_TEXT_NODE) {
        xsltTransformError(NULL, style, cur,
        "Misplaced text node (content: '%s').\n",
        (cur->content != NULL) ? cur->content : BAD_CAST "");
        style->errors++;
    } else if (cur->type != XML_ELEMENT_NODE) {
        xsltTransformError(NULL, style, cur, "Misplaced node.\n");
        style->errors++;
    }
    cur = cur->next;
    }
    /*
    * Skip xsl:import elements; they have been processed
    * already.
    */
    cur = node->children;
    while ((cur != NULL) && xsltParseFindTopLevelElem(cctxt, cur,
        BAD_CAST "import", XSLT_NAMESPACE, 1, &cur) == 1)
    cur = cur->next;
    if (cur == NULL)
    goto exit;

    start = cur;
    /*
    * Process all top-level xsl:param elements.
    */
    while ((cur != NULL) &&
    xsltParseFindTopLevelElem(cctxt, cur,
    BAD_CAST "param", XSLT_NAMESPACE, 0, &cur) == 1)
    {
    xsltParseTopLevelXSLTElem(cctxt, cur, XSLT_FUNC_PARAM); 
    cur = cur->next;
    }  
    /*
    * Process all top-level xsl:variable elements.
    */
    cur = start;
    while ((cur != NULL) &&
    xsltParseFindTopLevelElem(cctxt, cur,
    BAD_CAST "variable", XSLT_NAMESPACE, 0, &cur) == 1)
    {
    xsltParseTopLevelXSLTElem(cctxt, cur, XSLT_FUNC_VARIABLE);
    cur = cur->next;
    }   
    /*
    * Process all the rest of top-level elements.
    */
    cur = start;
    while (cur != NULL) {   
    /*
    * Process element nodes.
    */
    if (cur->type == XML_ELEMENT_NODE) {        
        if (cur->ns == NULL) {
        xsltTransformError(NULL, style, cur,
            "Unexpected top-level element in no namespace.\n");
        style->errors++;
        cur = cur->next;
        continue;
        }
        /*
        * Process all XSLT elements.
        */
        if (IS_XSLT_ELEM_FAST(cur)) {
        /*
        * xsl:import is only allowed at the beginning.
        */
        if (IS_XSLT_NAME(cur, "import")) {
            xsltTransformError(NULL, style, cur,
            "Misplaced xsl:import element.\n");
            style->errors++;
            cur = cur->next;
            continue;
        }
        /* 
        * TODO: Change the return type of the parsing functions
        *  to int.
        */
        if (IS_XSLT_NAME(cur, "template")) {
#ifdef WITH_XSLT_DEBUG_PARSING
            templates++;
#endif
            /*
            * TODO: Is the position of xsl:template in the
            *  tree significant? If not it would be easier to
            *  parse them at a later stage.
            */
            xsltParseXSLTTemplate(cctxt, cur);
        } else if (IS_XSLT_NAME(cur, "variable")) {
            /* NOP; done already */
        } else if (IS_XSLT_NAME(cur, "param")) {
            /* NOP; done already */
        } else if (IS_XSLT_NAME(cur, "include")) {          
            if (cur->psvi != NULL)          
            xsltParseXSLTStylesheetElemCore(cctxt, cur);
            else {
            xsltTransformError(NULL, style, cur,
                "Internal error: "
                "(xsltParseXSLTStylesheetElemCore) "
                "The xsl:include element was not compiled.\n");
            style->errors++;
            }
        } else if (IS_XSLT_NAME(cur, "strip-space")) {
            /* No node info needed. */
            xsltParseStylesheetStripSpace(style, cur);
        } else if (IS_XSLT_NAME(cur, "preserve-space")) {
            /* No node info needed. */
            xsltParseStylesheetPreserveSpace(style, cur);
        } else if (IS_XSLT_NAME(cur, "output")) {
            /* No node-info needed. */
            xsltParseStylesheetOutput(style, cur);
        } else if (IS_XSLT_NAME(cur, "key")) {
            /* TODO: node-info needed for expressions ? */
            xsltParseStylesheetKey(style, cur);
        } else if (IS_XSLT_NAME(cur, "decimal-format")) {
            /* No node-info needed. */           
            xsltParseStylesheetDecimalFormat(style, cur);
        } else if (IS_XSLT_NAME(cur, "attribute-set")) {            
            xsltParseTopLevelXSLTElem(cctxt, cur,
            XSLT_FUNC_ATTRSET);     
        } else if (IS_XSLT_NAME(cur, "namespace-alias")) {
            /* NOP; done already */         
        } else {
            if (cctxt->inode->forwardsCompat) {
            /*
            * Forwards-compatible mode:
            *
            * XSLT-1: "if it is a top-level element and
            *  XSLT 1.0 does not allow such elements as top-level
            *  elements, then the element must be ignored along
            *  with its content;"
            */
            /*
            * TODO: I don't think we should generate a warning.
            */
            xsltTransformError(NULL, style, cur,
                "Forwards-compatible mode: Ignoring unknown XSLT "
                "element '%s'.\n", cur->name);
            style->warnings++;
            } else {
            xsltTransformError(NULL, style, cur,
                "Unknown XSLT element '%s'.\n", cur->name);
            style->errors++;
            }
        }
        } else {
        xsltTopLevelFunction function;

        /*
        * Process non-XSLT elements, which are in a
        *  non-NULL namespace.
        */
        /*
        * QUESTION: What does xsltExtModuleTopLevelLookup()
        *  do exactly?
        */
        function = xsltExtModuleTopLevelLookup(cur->name,
            cur->ns->href);
        if (function != NULL)
            function(style, cur);
#ifdef WITH_XSLT_DEBUG_PARSING
        xsltGenericDebug(xsltGenericDebugContext,
            "xsltParseXSLTStylesheetElemCore : User-defined "
            "data element '%s'.\n", cur->name);
#endif
        }
    }
    cur = cur->next;
    }

exit:

#ifdef WITH_XSLT_DEBUG_PARSING
    xsltGenericDebug(xsltGenericDebugContext,
    "### END of parsing top-level elements of doc '%s'.\n",
    node->doc->URL);
    xsltGenericDebug(xsltGenericDebugContext,
    "### Templates: %d\n", templates);
#ifdef XSLT_REFACTORED
    xsltGenericDebug(xsltGenericDebugContext,
    "### Max inodes: %d\n", cctxt->maxNodeInfos);
    xsltGenericDebug(xsltGenericDebugContext,
    "### Max LREs  : %d\n", cctxt->maxLREs);
#endif /* XSLT_REFACTORED */
#endif /* WITH_XSLT_DEBUG_PARSING */

    xsltCompilerNodePop(cctxt, node);
    return(0);
}

static int
xsltParseXSLTStylesheetElem(xsltCompilerCtxtPtr cctxt, xmlNodePtr node)
{
    xmlNodePtr cur, start;

    if ((cctxt == NULL) || (node == NULL))
    return(-1);
    
    if (node->children == NULL)
    goto exit;

    /*
    * Process top-level elements:
    *  xsl:import (must be first)
    *  xsl:include (this is just a pre-processing)
    */
    cur = node->children;
    /*
    * Process xsl:import elements.
    * XSLT 1.0: "The xsl:import element children must precede all
    *  other element children of an xsl:stylesheet element,
    *  including any xsl:include element children."
    */    
    while ((cur != NULL) &&
    xsltParseFindTopLevelElem(cctxt, cur,
        BAD_CAST "import", XSLT_NAMESPACE, 1, &cur) == 1)
    {
    if (xsltParseStylesheetImport(cctxt->style, cur) != 0) {
        cctxt->style->errors++;
    }
    cur = cur->next;
    }
    if (cur == NULL)
    goto exit;
    start = cur;
    /*
    * Pre-process all xsl:include elements.
    */
    cur = start;
    while ((cur != NULL) &&
    xsltParseFindTopLevelElem(cctxt, cur,
        BAD_CAST "include", XSLT_NAMESPACE, 0, &cur) == 1)
    {
    xsltParseTopLevelXSLTElem(cctxt, cur, XSLT_FUNC_INCLUDE);
    cur = cur->next;
    }
    /*
    * Pre-process all xsl:namespace-alias elements.
    * URGENT TODO: This won't work correctly: the order of included
    *  aliases and aliases defined here is significant.
    */
    cur = start;
    while ((cur != NULL) &&
    xsltParseFindTopLevelElem(cctxt, cur,
        BAD_CAST "namespace-alias", XSLT_NAMESPACE, 0, &cur) == 1)
    {
    xsltNamespaceAlias(cctxt->style, cur);
    cur = cur->next;
    }

    if (cctxt->isInclude) {
    /*
    * If this stylesheet is intended for inclusion, then
    * we will process only imports and includes. 
    */
    goto exit;
    } 
    /*
    * Now parse the rest of the top-level elements.
    */
    xsltParseXSLTStylesheetElemCore(cctxt, node);   
exit:

    return(0);
}

#else /* XSLT_REFACTORED */

static void
xsltParseStylesheetTop(xsltStylesheetPtr style, xmlNodePtr top) {
    xmlNodePtr cur;
    xmlChar *prop;
#ifdef WITH_XSLT_DEBUG_PARSING
    int templates = 0;
#endif

    if (top == NULL)
    return;

    prop = xmlGetNsProp(top, (const xmlChar *)"version", NULL);
    if (prop == NULL) {
    xsltTransformError(NULL, style, top,
        "xsl:version is missing: document may not be a stylesheet\n");
    if (style != NULL) style->warnings++;
    } else {
    if ((!xmlStrEqual(prop, (const xmlChar *)"1.0")) &&
            (!xmlStrEqual(prop, (const xmlChar *)"1.1"))) {
        xsltTransformError(NULL, style, top,
        "xsl:version: only 1.0 features are supported\n");
         /* TODO set up compatibility when not XSLT 1.0 */
        if (style != NULL) style->warnings++;
    }
    xmlFree(prop);
    }

    /*
     * process xsl:import elements
     */
    cur = top->children;
    while (cur != NULL) {
        if (IS_BLANK_NODE(cur)) {
            cur = cur->next;
            continue;
        }
        if (IS_XSLT_ELEM(cur) && IS_XSLT_NAME(cur, "import")) {
            if (xsltParseStylesheetImport(style, cur) != 0)
                if (style != NULL) style->errors++;
        } else
            break;
        cur = cur->next;
    }

    /*
     * process other top-level elements
     */
    while (cur != NULL) {
    if (IS_BLANK_NODE(cur)) {
        cur = cur->next;
        continue;
    }
    if (cur->type == XML_TEXT_NODE) {
        if (cur->content != NULL) {
        xsltTransformError(NULL, style, cur,
            "misplaced text node: '%s'\n", cur->content);
        }
        if (style != NULL) style->errors++;
            cur = cur->next;
        continue;
    }
    if ((cur->type == XML_ELEMENT_NODE) && (cur->ns == NULL)) {
        xsltGenericError(xsltGenericErrorContext,
             "Found a top-level element %s with null namespace URI\n",
             cur->name);
        if (style != NULL) style->errors++;
        cur = cur->next;
        continue;
    }
    if ((cur->type == XML_ELEMENT_NODE) && (!(IS_XSLT_ELEM(cur)))) {
        xsltTopLevelFunction function;

        function = xsltExtModuleTopLevelLookup(cur->name,
                           cur->ns->href);
        if (function != NULL)
        function(style, cur);

#ifdef WITH_XSLT_DEBUG_PARSING
        xsltGenericDebug(xsltGenericDebugContext,
            "xsltParseStylesheetTop : found foreign element %s\n",
            cur->name);
#endif
            cur = cur->next;
        continue;
    }
    if (IS_XSLT_NAME(cur, "import")) {
        xsltTransformError(NULL, style, cur,
            "xsltParseStylesheetTop: ignoring misplaced import element\n");
        if (style != NULL) style->errors++;
    } else if (IS_XSLT_NAME(cur, "include")) {
        if (xsltParseStylesheetInclude(style, cur) != 0)
        if (style != NULL) style->errors++;
    } else if (IS_XSLT_NAME(cur, "strip-space")) {
        xsltParseStylesheetStripSpace(style, cur);
    } else if (IS_XSLT_NAME(cur, "preserve-space")) {
        xsltParseStylesheetPreserveSpace(style, cur);
    } else if (IS_XSLT_NAME(cur, "output")) {
        xsltParseStylesheetOutput(style, cur);
    } else if (IS_XSLT_NAME(cur, "key")) {
        xsltParseStylesheetKey(style, cur);
    } else if (IS_XSLT_NAME(cur, "decimal-format")) {
        xsltParseStylesheetDecimalFormat(style, cur);
    } else if (IS_XSLT_NAME(cur, "attribute-set")) {
        xsltParseStylesheetAttributeSet(style, cur);
    } else if (IS_XSLT_NAME(cur, "variable")) {
        xsltParseGlobalVariable(style, cur);
    } else if (IS_XSLT_NAME(cur, "param")) {
        xsltParseGlobalParam(style, cur);
    } else if (IS_XSLT_NAME(cur, "template")) {
#ifdef WITH_XSLT_DEBUG_PARSING
        templates++;
#endif
        xsltParseStylesheetTemplate(style, cur);
    } else if (IS_XSLT_NAME(cur, "namespace-alias")) {
        xsltNamespaceAlias(style, cur);
    } else {
        /*
        * BUG TODO: The version of the *doc* is irrelevant for
        *  the forwards-compatible mode.
        */
            if ((style != NULL) && (style->doc->version != NULL) &&
            (!strncmp((const char *) style->doc->version, "1.0", 3))) {
            xsltTransformError(NULL, style, cur,
            "xsltParseStylesheetTop: unknown %s element\n",
            cur->name);
            if (style != NULL) style->errors++;
        }
        else {
                /* do Forwards-Compatible Processing */
            xsltTransformError(NULL, style, cur,
            "xsltParseStylesheetTop: ignoring unknown %s element\n",
            cur->name);
            if (style != NULL) style->warnings++;
            }
    }
    cur = cur->next;
    }
#ifdef WITH_XSLT_DEBUG_PARSING
    xsltGenericDebug(xsltGenericDebugContext,
            "parsed %d templates\n", templates);
#endif
}

#endif /* else of XSLT_REFACTORED */

#ifdef XSLT_REFACTORED

static int
xsltParseSimplifiedStylesheetTree(xsltCompilerCtxtPtr cctxt,
                  xmlDocPtr doc,
                  xmlNodePtr node)
{
    xsltTemplatePtr templ;
    
    if ((cctxt == NULL) || (node == NULL))
    return(-1);

    if (xsltParseAttrXSLTVersion(cctxt, node, 0) == XSLT_ELEMENT_CATEGORY_LRE)
    {
    /*
    * TODO: Adjust report, since this might be an
    * embedded stylesheet.
    */
    xsltTransformError(NULL, cctxt->style, node,
        "The attribute 'xsl:version' is missing; cannot identify "
        "this document as an XSLT stylesheet document.\n");
    cctxt->style->errors++;
    return(1);
    }
    
#ifdef WITH_XSLT_DEBUG_PARSING
    xsltGenericDebug(xsltGenericDebugContext,
    "xsltParseSimplifiedStylesheetTree: document is stylesheet\n");
#endif        
    
    /*
    * Create and link the template
    */
    templ = xsltNewTemplate();
    if (templ == NULL) {
    return(-1);
    }
    templ->next = cctxt->style->templates;
    cctxt->style->templates = templ;
    templ->match = xmlStrdup(BAD_CAST "/");

    /*
    * Note that we push the document-node in this special case.
    */
    xsltCompilerNodePush(cctxt, (xmlNodePtr) doc);
    /*
    * In every case, we need to have
    * the in-scope namespaces of the element, where the
    * stylesheet is rooted at, regardless if it's an XSLT
    * instruction or a literal result instruction (or if
    * this is an embedded stylesheet).
    */
    cctxt->inode->inScopeNs =
    xsltCompilerBuildInScopeNsList(cctxt, node);
    /*
    * Parse the content and register the match-pattern.
    */
    xsltParseSequenceConstructor(cctxt, node);
    xsltCompilerNodePop(cctxt, (xmlNodePtr) doc);

    templ->elem = (xmlNodePtr) doc;
    templ->content = node;
    xsltAddTemplate(cctxt->style, templ, NULL, NULL);
    cctxt->style->literal_result = 1;
    return(0);
}

#ifdef XSLT_REFACTORED_XSLT_NSCOMP

int
xsltRestoreDocumentNamespaces(xsltNsMapPtr ns, xmlDocPtr doc)
{
    if (doc == NULL)
    return(-1);
    /*
    * Revert the changes we have applied to the namespace-URIs of
    * ns-decls.
    */    
    while (ns != NULL) {
    if ((ns->doc == doc) && (ns->ns != NULL)) {
        ns->ns->href = ns->origNsName;
        ns->origNsName = NULL;
        ns->ns = NULL;      
    }
    ns = ns->next;
    }
    return(0);
}
#endif /* XSLT_REFACTORED_XSLT_NSCOMP */

xsltStylesheetPtr
xsltParseStylesheetProcess(xsltStylesheetPtr style, xmlDocPtr doc)
{
    xsltCompilerCtxtPtr cctxt;
    xmlNodePtr cur;
    int oldIsSimplifiedStylesheet;

    xsltInitGlobals();

    if ((style == NULL) || (doc == NULL))
    return(NULL);

    cctxt = XSLT_CCTXT(style);

    cur = xmlDocGetRootElement(doc);
    if (cur == NULL) {
    xsltTransformError(NULL, style, (xmlNodePtr) doc,
        "xsltParseStylesheetProcess : empty stylesheet\n");
    return(NULL);
    }
    oldIsSimplifiedStylesheet = cctxt->simplified;

    if ((IS_XSLT_ELEM(cur)) && 
    ((IS_XSLT_NAME(cur, "stylesheet")) ||
     (IS_XSLT_NAME(cur, "transform")))) {   
#ifdef WITH_XSLT_DEBUG_PARSING
    xsltGenericDebug(xsltGenericDebugContext,
        "xsltParseStylesheetProcess : found stylesheet\n");
#endif
    cctxt->simplified = 0;
    style->literal_result = 0;
    } else {
    cctxt->simplified = 1;
    style->literal_result = 1;
    }
    /*
    * Pre-process the stylesheet if not already done before.
    *  This will remove PIs and comments, merge adjacent
    *  text nodes, internalize strings, etc.
    */
    if (! style->nopreproc)
    xsltParsePreprocessStylesheetTree(cctxt, cur);
    /*
    * Parse and compile the stylesheet.
    */
    if (style->literal_result == 0) {
    if (xsltParseXSLTStylesheetElem(cctxt, cur) != 0)
        return(NULL);
    } else {
    if (xsltParseSimplifiedStylesheetTree(cctxt, doc, cur) != 0)
        return(NULL);
    }    

    cctxt->simplified = oldIsSimplifiedStylesheet;

    return(style);
}

#else /* XSLT_REFACTORED */

xsltStylesheetPtr
xsltParseStylesheetProcess(xsltStylesheetPtr ret, xmlDocPtr doc) {
    xmlNodePtr cur;

    xsltInitGlobals();

    if (doc == NULL)
    return(NULL);
    if (ret == NULL)
    return(ret);
    
    /*
     * First steps, remove blank nodes,
     * locate the xsl:stylesheet element and the
     * namespace declaration.
     */
    cur = xmlDocGetRootElement(doc);
    if (cur == NULL) {
    xsltTransformError(NULL, ret, (xmlNodePtr) doc,
        "xsltParseStylesheetProcess : empty stylesheet\n");
    return(NULL);
    }

    if ((IS_XSLT_ELEM(cur)) && 
    ((IS_XSLT_NAME(cur, "stylesheet")) ||
     (IS_XSLT_NAME(cur, "transform")))) {   
#ifdef WITH_XSLT_DEBUG_PARSING
    xsltGenericDebug(xsltGenericDebugContext,
        "xsltParseStylesheetProcess : found stylesheet\n");
#endif
    ret->literal_result = 0;
    xsltParseStylesheetExcludePrefix(ret, cur, 1);
    xsltParseStylesheetExtPrefix(ret, cur, 1);
    } else {
    xsltParseStylesheetExcludePrefix(ret, cur, 0);
    xsltParseStylesheetExtPrefix(ret, cur, 0);
    ret->literal_result = 1;
    }
    if (!ret->nopreproc) {
    xsltPrecomputeStylesheet(ret, cur);
    }
    if (ret->literal_result == 0) {
    xsltParseStylesheetTop(ret, cur);
    } else {
    xmlChar *prop;
    xsltTemplatePtr template;

    /*
     * the document itself might be the template, check xsl:version
     */
    prop = xmlGetNsProp(cur, (const xmlChar *)"version", XSLT_NAMESPACE);
    if (prop == NULL) {
        xsltTransformError(NULL, ret, cur,
        "xsltParseStylesheetProcess : document is not a stylesheet\n");
        return(NULL);
    }

#ifdef WITH_XSLT_DEBUG_PARSING
        xsltGenericDebug(xsltGenericDebugContext,
        "xsltParseStylesheetProcess : document is stylesheet\n");
#endif
    
    if (!xmlStrEqual(prop, (const xmlChar *)"1.0")) {
        xsltTransformError(NULL, ret, cur,
        "xsl:version: only 1.0 features are supported\n");
         /* TODO set up compatibility when not XSLT 1.0 */
        ret->warnings++;
    }
    xmlFree(prop);

    /*
     * Create and link the template
     */
    template = xsltNewTemplate();
    if (template == NULL) {
        return(NULL);
    }
    template->next = ret->templates;
    ret->templates = template;
    template->match = xmlStrdup((const xmlChar *)"/");

    /*
     * parse the content and register the pattern
     */
    xsltParseTemplateContent(ret, (xmlNodePtr) doc);
    template->elem = (xmlNodePtr) doc;
    template->content = doc->children;
    xsltAddTemplate(ret, template, NULL, NULL);
    ret->literal_result = 1;    
    }

    return(ret);
}

#endif /* else of XSLT_REFACTORED */

xsltStylesheetPtr
xsltParseStylesheetImportedDoc(xmlDocPtr doc,
                   xsltStylesheetPtr parentStyle) {
    xsltStylesheetPtr retStyle;

    if (doc == NULL)
    return(NULL);

    retStyle = xsltNewStylesheet();
    if (retStyle == NULL)
    return(NULL);
    /*
    * Set the importing stylesheet module; also used to detect recursion.
    */
    retStyle->parent = parentStyle;
    /*
    * Adjust the string dict.
    */
    if (doc->dict != NULL) {
        xmlDictFree(retStyle->dict);
    retStyle->dict = doc->dict;
#ifdef WITH_XSLT_DEBUG
        xsltGenericDebug(xsltGenericDebugContext,
        "reusing dictionary from %s for stylesheet\n",
        doc->URL);
#endif
    xmlDictReference(retStyle->dict);
    }       
    
    /*
    * TODO: Eliminate xsltGatherNamespaces(); we must not restrict
    *  the stylesheet to containt distinct namespace prefixes.
    */
    xsltGatherNamespaces(retStyle);

#ifdef XSLT_REFACTORED
    {
    xsltCompilerCtxtPtr cctxt;
    xsltStylesheetPtr oldCurSheet;
        
    if (parentStyle == NULL) {
        xsltPrincipalStylesheetDataPtr principalData;
        /*
        * Principal stylesheet
        * --------------------
        */
        retStyle->principal = retStyle;
        /*
        * Create extra data for the principal stylesheet.
        */
        principalData = xsltNewPrincipalStylesheetData();
        if (principalData == NULL) {
        xsltFreeStylesheet(retStyle);
        return(NULL);
        }
        retStyle->principalData = principalData;
        /*
        * Create the compilation context
        * ------------------------------
        * (only once; for the principal stylesheet).
        * This is currently the only function where the
        * compilation context is created.
        */
        cctxt = xsltCompilationCtxtCreate(retStyle);
        if (cctxt == NULL) {
        xsltFreeStylesheet(retStyle);
        return(NULL);
        }               
        retStyle->compCtxt = (void *) cctxt;
        cctxt->style = retStyle;
        cctxt->dict = retStyle->dict;
        cctxt->psData = principalData;
        /*
        * Push initial dummy node info.
        */
        cctxt->depth = -1;
        xsltCompilerNodePush(cctxt, (xmlNodePtr) doc);
    } else {
        /*
        * Imported stylesheet.
        */
        retStyle->principal = parentStyle->principal;
        cctxt = parentStyle->compCtxt;
        retStyle->compCtxt = cctxt;
    }
    /*
    * Save the old and set the current stylesheet structure in the
    * compilation context.
    */
    oldCurSheet = cctxt->style;
    cctxt->style = retStyle;
    
    retStyle->doc = doc;
    xsltParseStylesheetProcess(retStyle, doc);
    
    cctxt->style = oldCurSheet;
    if (parentStyle == NULL) {
        /*
        * Pop the initial dummy node info.
        */
        xsltCompilerNodePop(cctxt, (xmlNodePtr) doc);
    } else {
        /*
        * Clear the compilation context of imported
        * stylesheets.
        * TODO: really?
        */
        /* retStyle->compCtxt = NULL; */
    }
    /*
    * Free the stylesheet if there were errors.
    */
    if (retStyle != NULL) {
        if (retStyle->errors != 0) {
#ifdef XSLT_REFACTORED_XSLT_NSCOMP
        /*
        * Restore all changes made to namespace URIs of ns-decls.
        */
        if (cctxt->psData->nsMap)       
            xsltRestoreDocumentNamespaces(cctxt->psData->nsMap, doc);
#endif
        /*
        * Detach the doc from the stylesheet; otherwise the doc
        * will be freed in xsltFreeStylesheet().
        */
        retStyle->doc = NULL;
        /*
        * Cleanup the doc if its the main stylesheet.
        */
        if (parentStyle == NULL) {
            xsltCleanupStylesheetTree(doc, xmlDocGetRootElement(doc));
            if (retStyle->compCtxt != NULL) {           
            xsltCompilationCtxtFree(retStyle->compCtxt);
            retStyle->compCtxt = NULL;
            }
        }

        xsltFreeStylesheet(retStyle);
        retStyle = NULL;
        }
    }
    }
        
#else /* XSLT_REFACTORED */
    /*
    * Old behaviour.
    */
    retStyle->doc = doc;
    if (xsltParseStylesheetProcess(retStyle, doc) == NULL) {
        retStyle->doc = NULL;
        xsltFreeStylesheet(retStyle);
        retStyle = NULL;
    }
    if (retStyle != NULL) {
    if (retStyle->errors != 0) {
        retStyle->doc = NULL;
        if (parentStyle == NULL)
        xsltCleanupStylesheetTree(doc,
            xmlDocGetRootElement(doc));
        xsltFreeStylesheet(retStyle);
        retStyle = NULL;
    }
    }
#endif /* else of XSLT_REFACTORED */
        
    return(retStyle);
}

xsltStylesheetPtr
xsltParseStylesheetDoc(xmlDocPtr doc) {
    xsltStylesheetPtr ret;

    xsltInitGlobals();

    ret = xsltParseStylesheetImportedDoc(doc, NULL);
    if (ret == NULL)
    return(NULL);

    xsltResolveStylesheetAttributeSet(ret);
#ifdef XSLT_REFACTORED
    /*
    * Free the compilation context.
    * TODO: Check if it's better to move this cleanup to
    *   xsltParseStylesheetImportedDoc().
    */
    if (ret->compCtxt != NULL) {
    xsltCompilationCtxtFree(XSLT_CCTXT(ret));
    ret->compCtxt = NULL;
    }
#endif
    return(ret);
}

xsltStylesheetPtr
xsltParseStylesheetFile(const xmlChar* filename) {
    xsltSecurityPrefsPtr sec;
    xsltStylesheetPtr ret;
    xmlDocPtr doc;
    
    xsltInitGlobals();

    if (filename == NULL)
    return(NULL);

#ifdef WITH_XSLT_DEBUG_PARSING
    xsltGenericDebug(xsltGenericDebugContext,
        "xsltParseStylesheetFile : parse %s\n", filename);
#endif

    /*
     * Security framework check
     */
    sec = xsltGetDefaultSecurityPrefs();
    if (sec != NULL) {
    int res;

    res = xsltCheckRead(sec, NULL, filename);
    if (res == 0) {
        xsltTransformError(NULL, NULL, NULL,
         "xsltParseStylesheetFile: read rights for %s denied\n",
                 filename);
        return(NULL);
    }
    }

    doc = xsltDocDefaultLoader(filename, NULL, XSLT_PARSE_OPTIONS,
                               NULL, XSLT_LOAD_START);
    if (doc == NULL) {
    xsltTransformError(NULL, NULL, NULL,
        "xsltParseStylesheetFile : cannot parse %s\n", filename);
    return(NULL);
    }
    ret = xsltParseStylesheetDoc(doc);
    if (ret == NULL) {
    xmlFreeDoc(doc);
    return(NULL);
    }

    return(ret);
}

/************************************************************************
 *                                  *
 *          Handling of Stylesheet PI           *
 *                                  *
 ************************************************************************/

#define CUR (*cur)
#define SKIP(val) cur += (val)
#define NXT(val) cur[(val)]
#define SKIP_BLANKS                     \
    while (IS_BLANK(CUR)) NEXT
#define NEXT ((*cur) ?  cur++ : cur)

static xmlChar *
xsltParseStylesheetPI(const xmlChar *value) {
    const xmlChar *cur;
    const xmlChar *start;
    xmlChar *val;
    xmlChar tmp;
    xmlChar *href = NULL;
    int isXml = 0;

    if (value == NULL)
    return(NULL);

    cur = value;
    while (CUR != 0) {
    SKIP_BLANKS;
    if ((CUR == 't') && (NXT(1) == 'y') && (NXT(2) == 'p') &&
        (NXT(3) == 'e')) {
        SKIP(4);
        SKIP_BLANKS;
        if (CUR != '=')
        continue;
        NEXT;
        if ((CUR != '\'') && (CUR != '"'))
        continue;
        tmp = CUR;
        NEXT;
        start = cur;
        while ((CUR != 0) && (CUR != tmp))
        NEXT;
        if (CUR != tmp)
        continue;
        val = xmlStrndup(start, cur - start);
        NEXT;
        if (val == NULL) 
        return(NULL);
        if ((xmlStrcasecmp(val, BAD_CAST "text/xml")) &&
        (xmlStrcasecmp(val, BAD_CAST "text/xsl"))) {
                xmlFree(val);
        break;
        }
        isXml = 1;
        xmlFree(val);
    } else if ((CUR == 'h') && (NXT(1) == 'r') && (NXT(2) == 'e') &&
        (NXT(3) == 'f')) {
        SKIP(4);
        SKIP_BLANKS;
        if (CUR != '=')
        continue;
        NEXT;
        if ((CUR != '\'') && (CUR != '"'))
        continue;
        tmp = CUR;
        NEXT;
        start = cur;
        while ((CUR != 0) && (CUR != tmp))
        NEXT;
        if (CUR != tmp)
        continue;
        if (href == NULL)
        href = xmlStrndup(start, cur - start);
        NEXT;
    } else {
        while ((CUR != 0) && (!IS_BLANK(CUR)))
        NEXT;
    }
            
    }

    if (!isXml) {
    if (href != NULL)
        xmlFree(href);
    href = NULL;
    }
    return(href);
}

xsltStylesheetPtr
xsltLoadStylesheetPI(xmlDocPtr doc) {
    xmlNodePtr child;
    xsltStylesheetPtr ret = NULL;
    xmlChar *href = NULL;
    xmlURIPtr URI;

    xsltInitGlobals();

    if (doc == NULL)
    return(NULL);

    /*
     * Find the text/xml stylesheet PI id any before the root
     */
    child = doc->children;
    while ((child != NULL) && (child->type != XML_ELEMENT_NODE)) {
    if ((child->type == XML_PI_NODE) &&
        (xmlStrEqual(child->name, BAD_CAST "xml-stylesheet"))) {
        href = xsltParseStylesheetPI(child->content);
        if (href != NULL)
        break;
    }
    child = child->next;
    }

    /*
     * If found check the href to select processing
     */
    if (href != NULL) {
#ifdef WITH_XSLT_DEBUG_PARSING
    xsltGenericDebug(xsltGenericDebugContext,
        "xsltLoadStylesheetPI : found PI href=%s\n", href);
#endif
    URI = xmlParseURI((const char *) href);
    if (URI == NULL) {
        xsltTransformError(NULL, NULL, child,
            "xml-stylesheet : href %s is not valid\n", href);
        xmlFree(href);
        return(NULL);
    }
    if ((URI->fragment != NULL) && (URI->scheme == NULL) &&
            (URI->opaque == NULL) && (URI->authority == NULL) &&
            (URI->server == NULL) && (URI->user == NULL) &&
            (URI->path == NULL) && (URI->query == NULL)) {
        xmlAttrPtr ID;

#ifdef WITH_XSLT_DEBUG_PARSING
        xsltGenericDebug(xsltGenericDebugContext,
            "xsltLoadStylesheetPI : Reference to ID %s\n", href);
#endif
        if (URI->fragment[0] == '#')
        ID = xmlGetID(doc, (const xmlChar *) &(URI->fragment[1]));
        else
        ID = xmlGetID(doc, (const xmlChar *) URI->fragment);
        if (ID == NULL) {
        xsltTransformError(NULL, NULL, child,
            "xml-stylesheet : no ID %s found\n", URI->fragment);
        } else {
        xmlDocPtr fake;
        xmlNodePtr subtree, newtree;
        xmlNsPtr ns;

#ifdef WITH_XSLT_DEBUG
        xsltGenericDebug(xsltGenericDebugContext,
            "creating new document from %s for embedded stylesheet\n",
            doc->URL);
#endif
        /*
         * move the subtree in a new document passed to
         * the stylesheet analyzer
         */
        subtree = ID->parent;
        fake = xmlNewDoc(NULL);
        if (fake != NULL) {
            /*
            * Should the dictionary still be shared even though
            * the nodes are being copied rather than moved?
            */
            fake->dict = doc->dict;
            xmlDictReference(doc->dict);
#ifdef WITH_XSLT_DEBUG
            xsltGenericDebug(xsltGenericDebugContext,
            "reusing dictionary from %s for embedded stylesheet\n",
            doc->URL);
#endif

            newtree = xmlDocCopyNode(subtree, fake, 1);

            fake->URL = xmlNodeGetBase(doc, subtree->parent);
#ifdef WITH_XSLT_DEBUG
            xsltGenericDebug(xsltGenericDebugContext,
            "set base URI for embedded stylesheet as %s\n",
            fake->URL);
#endif

            /*
            * Add all namespaces in scope of embedded stylesheet to
            * root element of newly created stylesheet document
            */
            while ((subtree = subtree->parent) != (xmlNodePtr)doc) {
            for (ns = subtree->ns; ns; ns = ns->next) {
                xmlNewNs(newtree,  ns->href, ns->prefix);
            }
            }

            xmlAddChild((xmlNodePtr)fake, newtree);
            ret = xsltParseStylesheetDoc(fake);
            if (ret == NULL)
            xmlFreeDoc(fake);
        }
        }
    } else {
        xmlChar *URL, *base;

        /*
         * Reference to an external stylesheet
         */

        base = xmlNodeGetBase(doc, (xmlNodePtr) doc);
        URL = xmlBuildURI(href, base);
        if (URL != NULL) {
#ifdef WITH_XSLT_DEBUG_PARSING
        xsltGenericDebug(xsltGenericDebugContext,
            "xsltLoadStylesheetPI : fetching %s\n", URL);
#endif
        ret = xsltParseStylesheetFile(URL);
        xmlFree(URL);
        } else {
#ifdef WITH_XSLT_DEBUG_PARSING
        xsltGenericDebug(xsltGenericDebugContext,
            "xsltLoadStylesheetPI : fetching %s\n", href);
#endif
        ret = xsltParseStylesheetFile(href);
        }
        if (base != NULL)
        xmlFree(base);
    }
    xmlFreeURI(URI);
    xmlFree(href);
    }
    return(ret);
}