/*
 * Summary: internal data structures, constants and functions
 * Description: Internal data structures, constants and functions used
 *              by the XSLT engine. 
 *              They are not part of the API or ABI, i.e. they can change
 *              without prior notice, use carefully.
 *
 * Copy: See Copyright for the status of this software.
 *
 * Author: Daniel Veillard
 */

#ifndef __XML_XSLT_INTERNALS_H__
#define __XML_XSLT_INTERNALS_H__

#include <libxml/tree.h>
#include <libxml/hash.h>
#include <libxml/xpath.h>
#include <libxml/xmlerror.h>
#include <libxml/dict.h>
#include <libxml/xmlstring.h>
#include <libxslt/xslt.h>
#include "xsltexports.h"
#include "xsltlocale.h"
#include "numbersInternals.h"

#ifdef __cplusplus
extern "C" {
#endif

/* #define XSLT_DEBUG_PROFILE_CACHE */

/**
 * XSLT_IS_TEXT_NODE:
 *
 * check if the argument is a text node
 */
#define XSLT_IS_TEXT_NODE(n) ((n != NULL) && \
    (((n)->type == XML_TEXT_NODE) || \
     ((n)->type == XML_CDATA_SECTION_NODE)))


/**
 * XSLT_MARK_RES_TREE_FRAG:
 *
 * internal macro to set up tree fragments
 */
#define XSLT_MARK_RES_TREE_FRAG(n) \
    (n)->name = (char *) xmlStrdup(BAD_CAST " fake node libxslt");

/**
 * XSLT_IS_RES_TREE_FRAG:
 *
 * internal macro to test tree fragments
 */
#define XSLT_IS_RES_TREE_FRAG(n) \
    ((n != NULL) && ((n)->type == XML_DOCUMENT_NODE) && \
     ((n)->name != NULL) && ((n)->name[0] == ' '))

/**
 * XSLT_REFACTORED_KEYCOMP:
 *
 * Internal define to enable on-demand xsl:key computation.
 * That's the only mode now but the define is kept for compatibility
 */
#define XSLT_REFACTORED_KEYCOMP

/**
 * XSLT_FAST_IF:
 *
 * Internal define to enable usage of xmlXPathCompiledEvalToBoolean()
 * for XSLT "tests"; e.g. in <xsl:if test="/foo/bar">
 */
#define XSLT_FAST_IF

/**
 * XSLT_REFACTORED:
 *
 * Internal define to enable the refactored parts of Libxslt.
 */
/* #define XSLT_REFACTORED */
/* ==================================================================== */

/**
 * XSLT_REFACTORED_VARS:
 *
 * Internal define to enable the refactored variable part of libxslt
 */
#define XSLT_REFACTORED_VARS

#ifdef XSLT_REFACTORED

extern const xmlChar *xsltXSLTAttrMarker;


/* TODO: REMOVE: #define XSLT_REFACTORED_EXCLRESNS */

/* TODO: REMOVE: #define XSLT_REFACTORED_NSALIAS */

/**
 * XSLT_REFACTORED_XSLT_NSCOMP
 *
 * Internal define to enable the pointer-comparison of
 * namespaces of XSLT elements. 
 */
/* #define XSLT_REFACTORED_XSLT_NSCOMP */

/**
 * XSLT_REFACTORED_XPATHCOMP:
 *
 * Internal define to enable the optimization of the
 * compilation of XPath expressions.
 */
#define XSLT_REFACTORED_XPATHCOMP

#ifdef XSLT_REFACTORED_XSLT_NSCOMP

extern const xmlChar *xsltConstNamespaceNameXSLT;

/**
 * IS_XSLT_ELEM_FAST:
 *
 * quick test to detect XSLT elements
 */
#define IS_XSLT_ELEM_FAST(n) \
    (((n) != NULL) && ((n)->ns != NULL) && \
    ((n)->ns->href == xsltConstNamespaceNameXSLT))

/**
 * IS_XSLT_ATTR_FAST:
 *
 * quick test to detect XSLT attributes
 */
#define IS_XSLT_ATTR_FAST(a) \
    (((a) != NULL) && ((a)->ns != NULL) && \
    ((a)->ns->href == xsltConstNamespaceNameXSLT))

/**
 * XSLT_HAS_INTERNAL_NSMAP:
 *
 * check for namespace mapping
 */
#define XSLT_HAS_INTERNAL_NSMAP(s) \
    (((s) != NULL) && ((s)->principal) && \
     ((s)->principal->principalData) && \
     ((s)->principal->principalData->nsMap))

/**
 * XSLT_GET_INTERNAL_NSMAP:
 *
 * get pointer to namespace map
 */
#define XSLT_GET_INTERNAL_NSMAP(s) ((s)->principal->principalData->nsMap)

#else /* XSLT_REFACTORED_XSLT_NSCOMP */

/**
 * IS_XSLT_ELEM_FAST:
 *
 * quick check whether this is an xslt element
 */
#define IS_XSLT_ELEM_FAST(n) \
    (((n) != NULL) && ((n)->ns != NULL) && \
     (xmlStrEqual((n)->ns->href, XSLT_NAMESPACE)))

/**
 * IS_XSLT_ATTR_FAST:
 *
 * quick check for xslt namespace attribute
 */
#define IS_XSLT_ATTR_FAST(a) \
    (((a) != NULL) && ((a)->ns != NULL) && \
     (xmlStrEqual((a)->ns->href, XSLT_NAMESPACE)))


#endif /* XSLT_REFACTORED_XSLT_NSCOMP */


/**
 * XSLT_REFACTORED_MANDATORY_VERSION:
 *
 * TODO: Currently disabled to surpress regression test failures, since
 *  the old behaviour was that a missing version attribute
 *  produced a only a warning and not an error, which was incerrect.
 *  So the regression tests need to be fixed if this is enabled.
 */
/* #define XSLT_REFACTORED_MANDATORY_VERSION */

/**
 * xsltPointerList:
 *
 * Pointer-list for various purposes.
 */
typedef struct _xsltPointerList xsltPointerList;
typedef xsltPointerList *xsltPointerListPtr;
struct _xsltPointerList {
    void **items;
    int number;
    int size;
};

#endif

/**
 * XSLT_REFACTORED_PARSING:
 *
 * Internal define to enable the refactored parts of Libxslt
 * related to parsing.
 */
/* #define XSLT_REFACTORED_PARSING */

/**
 * XSLT_MAX_SORT:
 *
 * Max number of specified xsl:sort on an element.
 */
#define XSLT_MAX_SORT 15

/**
 * XSLT_PAT_NO_PRIORITY:
 *
 * Specific value for pattern without priority expressed.
 */
#define XSLT_PAT_NO_PRIORITY -12345789

/**
 * xsltRuntimeExtra:
 *
 * Extra information added to the transformation context.
 */
typedef struct _xsltRuntimeExtra xsltRuntimeExtra;
typedef xsltRuntimeExtra *xsltRuntimeExtraPtr;
struct _xsltRuntimeExtra {
    void       *info;		/* pointer to the extra data */
    xmlFreeFunc deallocate;	/* pointer to the deallocation routine */
    union {			/* dual-purpose field */
        void   *ptr;		/* data not needing deallocation */
	int    ival;		/* integer value storage */
    } val;
};

/**
 * XSLT_RUNTIME_EXTRA_LST:
 * @ctxt: the transformation context
 * @nr: the index
 *
 * Macro used to access extra information stored in the context
 */
#define XSLT_RUNTIME_EXTRA_LST(ctxt, nr) (ctxt)->extras[(nr)].info
/**
 * XSLT_RUNTIME_EXTRA_FREE:
 * @ctxt: the transformation context
 * @nr: the index
 *
 * Macro used to free extra information stored in the context
 */
#define XSLT_RUNTIME_EXTRA_FREE(ctxt, nr) (ctxt)->extras[(nr)].deallocate
/**
 * XSLT_RUNTIME_EXTRA:
 * @ctxt: the transformation context
 * @nr: the index
 *
 * Macro used to define extra information stored in the context
 */
#define	XSLT_RUNTIME_EXTRA(ctxt, nr, typ) (ctxt)->extras[(nr)].val.typ

/**
 * xsltTemplate:
 *
 * The in-memory structure corresponding to an XSLT Template.
 */
typedef struct _xsltTemplate xsltTemplate;
typedef xsltTemplate *xsltTemplatePtr;
struct _xsltTemplate {
    struct _xsltTemplate *next;/* chained list sorted by priority */
    struct _xsltStylesheet *style;/* the containing stylesheet */
    xmlChar *match;	/* the matching string */
    float priority;	/* as given from the stylesheet, not computed */
    const xmlChar *name; /* the local part of the name QName */
    const xmlChar *nameURI; /* the URI part of the name QName */
    const xmlChar *mode;/* the local part of the mode QName */
    const xmlChar *modeURI;/* the URI part of the mode QName */
    xmlNodePtr content;	/* the template replacement value */
    xmlNodePtr elem;	/* the source element */

    /*
    * TODO: @inheritedNsNr and @inheritedNs won't be used in the
    *  refactored code.
    */
    int inheritedNsNr;  /* number of inherited namespaces */
    xmlNsPtr *inheritedNs;/* inherited non-excluded namespaces */

    /* Profiling informations */
    int nbCalls;        /* the number of time the template was called */
    unsigned long time; /* the time spent in this template */
    void *params;       /* xsl:param instructions */
};

/**
 * xsltDecimalFormat:
 *
 * Data structure of decimal-format.
 */
typedef struct _xsltDecimalFormat xsltDecimalFormat;
typedef xsltDecimalFormat *xsltDecimalFormatPtr;
struct _xsltDecimalFormat {
    struct _xsltDecimalFormat *next; /* chained list */
    xmlChar *name;
    /* Used for interpretation of pattern */
    xmlChar *digit;
    xmlChar *patternSeparator;
    /* May appear in result */
    xmlChar *minusSign;
    xmlChar *infinity;
    xmlChar *noNumber; /* Not-a-number */
    /* Used for interpretation of pattern and may appear in result */
    xmlChar *decimalPoint;
    xmlChar *grouping;
    xmlChar *percent;
    xmlChar *permille;
    xmlChar *zeroDigit;
};

/**
 * xsltDocument:
 *
 * Data structure associated to a parsed document.
 */
typedef struct _xsltDocument xsltDocument;
typedef xsltDocument *xsltDocumentPtr;
struct _xsltDocument {
    struct _xsltDocument *next;	/* documents are kept in a chained list */
    int main;			/* is this the main document */
    xmlDocPtr doc;		/* the parsed document */
    void *keys;			/* key tables storage */
    struct _xsltDocument *includes; /* subsidiary includes */
    int preproc;		/* pre-processing already done */
    int nbKeysComputed;
};

/**
 * xsltKeyDef:
 *
 * Representation of an xsl:key.
 */
typedef struct _xsltKeyDef xsltKeyDef;
typedef xsltKeyDef *xsltKeyDefPtr;
struct _xsltKeyDef {
    struct _xsltKeyDef *next;
    xmlNodePtr inst;
    xmlChar *name;
    xmlChar *nameURI;
    xmlChar *match;
    xmlChar *use;
    xmlXPathCompExprPtr comp;
    xmlXPathCompExprPtr usecomp;
    xmlNsPtr *nsList;           /* the namespaces in scope */
    int nsNr;                   /* the number of namespaces in scope */
};

/**
 * xsltKeyTable:
 *
 * Holds the computed keys for key definitions of the same QName.
 * Is owned by an xsltDocument.
 */
typedef struct _xsltKeyTable xsltKeyTable;
typedef xsltKeyTable *xsltKeyTablePtr;
struct _xsltKeyTable {
    struct _xsltKeyTable *next;
    xmlChar *name;
    xmlChar *nameURI;
    xmlHashTablePtr keys;
};

/*
 * The in-memory structure corresponding to an XSLT Stylesheet.
 * NOTE: most of the content is simply linked from the doc tree
 *       structure, no specific allocation is made.
 */
typedef struct _xsltStylesheet xsltStylesheet;
typedef xsltStylesheet *xsltStylesheetPtr;

typedef struct _xsltTransformContext xsltTransformContext;
typedef xsltTransformContext *xsltTransformContextPtr;

/**
 * xsltElemPreComp:
 *
 * The in-memory structure corresponding to element precomputed data,
 * designed to be extended by extension implementors.
 */
typedef struct _xsltElemPreComp xsltElemPreComp;
typedef xsltElemPreComp *xsltElemPreCompPtr;

/**
 * xsltTransformFunction:
 * @ctxt: the XSLT transformation context
 * @node: the input node
 * @inst: the stylesheet node
 * @comp: the compiled information from the stylesheet
 *
 * Signature of the function associated to elements part of the
 * stylesheet language like xsl:if or xsl:apply-templates.
 */
typedef void (*xsltTransformFunction) (xsltTransformContextPtr ctxt,
	                               xmlNodePtr node,
				       xmlNodePtr inst,
			               xsltElemPreCompPtr comp);

/**
 * xsltSortFunc:
 * @ctxt:    a transformation context
 * @sorts:   the node-set to sort
 * @nbsorts: the number of sorts
 *
 * Signature of the function to use during sorting
 */
typedef void (*xsltSortFunc) (xsltTransformContextPtr ctxt, xmlNodePtr *sorts,
			      int nbsorts);

typedef enum {
    XSLT_FUNC_COPY=1,
    XSLT_FUNC_SORT,
    XSLT_FUNC_TEXT,
    XSLT_FUNC_ELEMENT,
    XSLT_FUNC_ATTRIBUTE,
    XSLT_FUNC_COMMENT,
    XSLT_FUNC_PI,
    XSLT_FUNC_COPYOF,
    XSLT_FUNC_VALUEOF,
    XSLT_FUNC_NUMBER,
    XSLT_FUNC_APPLYIMPORTS,
    XSLT_FUNC_CALLTEMPLATE,
    XSLT_FUNC_APPLYTEMPLATES,
    XSLT_FUNC_CHOOSE,
    XSLT_FUNC_IF,
    XSLT_FUNC_FOREACH,
    XSLT_FUNC_DOCUMENT,
    XSLT_FUNC_WITHPARAM,
    XSLT_FUNC_PARAM,
    XSLT_FUNC_VARIABLE,
    XSLT_FUNC_WHEN,
    XSLT_FUNC_EXTENSION
#ifdef XSLT_REFACTORED
    ,
    XSLT_FUNC_OTHERWISE,
    XSLT_FUNC_FALLBACK,
    XSLT_FUNC_MESSAGE,
    XSLT_FUNC_INCLUDE,
    XSLT_FUNC_ATTRSET,
    XSLT_FUNC_LITERAL_RESULT_ELEMENT,
    XSLT_FUNC_UNKOWN_FORWARDS_COMPAT
#endif
} xsltStyleType;

/**
 * xsltElemPreCompDeallocator:
 * @comp:  the #xsltElemPreComp to free up
 *
 * Deallocates an #xsltElemPreComp structure.
 */
typedef void (*xsltElemPreCompDeallocator) (xsltElemPreCompPtr comp);

/**
 * xsltElemPreComp:
 *
 * The basic structure for compiled items of the AST of the XSLT processor.
 * This structure is also intended to be extended by extension implementors.
 * TODO: This is somehow not nice, since it has a "free" field, which
 *   derived stylesheet-structs do not have.
 */
struct _xsltElemPreComp {
    xsltElemPreCompPtr next;		/* next item in the global chained
					   list hold by xsltStylesheet. */
    xsltStyleType type;		/* type of the element */
    xsltTransformFunction func; 	/* handling function */
    xmlNodePtr inst;			/* the node in the stylesheet's tree
					   corresponding to this item */

    /* end of common part */
    xsltElemPreCompDeallocator free;	/* the deallocator */
};

/**
 * xsltStylePreComp:
 *
 * The abstract basic structure for items of the XSLT processor.
 * This includes:
 * 1) compiled forms of XSLT instructions (xsl:if, xsl:attribute, etc.)
 * 2) compiled forms of literal result elements
 * 3) compiled forms of extension elements
 */
typedef struct _xsltStylePreComp xsltStylePreComp;
typedef xsltStylePreComp *xsltStylePreCompPtr;

#ifdef XSLT_REFACTORED

/*
* Some pointer-list utility functions.
*/
XSLTPUBFUN xsltPointerListPtr XSLTCALL
		xsltPointerListCreate		(int initialSize);
XSLTPUBFUN void XSLTCALL
		xsltPointerListFree		(xsltPointerListPtr list);
XSLTPUBFUN void XSLTCALL
		xsltPointerListClear		(xsltPointerListPtr list);
XSLTPUBFUN int XSLTCALL
		xsltPointerListAddSize		(xsltPointerListPtr list,						 
						 void *item,
						 int initialSize);

/************************************************************************
 *									*
 * Refactored structures                                                *
 *									*
 ************************************************************************/

typedef struct _xsltNsListContainer xsltNsListContainer;
typedef xsltNsListContainer *xsltNsListContainerPtr;
struct _xsltNsListContainer {
    xmlNsPtr *list;
    int totalNumber;
    int xpathNumber;    
};

/**
 * XSLT_ITEM_COMPATIBILITY_FIELDS:
 * 
 * Fields for API compatibility to the structure
 * _xsltElemPreComp which is used for extension functions.
 * Note that @next is used for storage; it does not reflect a next
 * sibling in the tree.
 * TODO: Evaluate if we really need such a compatibility.
 */
#define XSLT_ITEM_COMPATIBILITY_FIELDS \
    xsltElemPreCompPtr next;\
    xsltStyleType type;\
    xsltTransformFunction func;\
    xmlNodePtr inst;

/**
 * XSLT_ITEM_NAVIGATION_FIELDS:
 *
 * Currently empty.
 * TODO: It is intended to hold navigational fields in the future.
 */
#define XSLT_ITEM_NAVIGATION_FIELDS
/*
    xsltStylePreCompPtr parent;\
    xsltStylePreCompPtr children;\
    xsltStylePreCompPtr nextItem; 
*/

/**
 * XSLT_ITEM_NSINSCOPE_FIELDS:
 *
 * The in-scope namespaces.
 */
#define XSLT_ITEM_NSINSCOPE_FIELDS xsltNsListContainerPtr inScopeNs;

/**
 * XSLT_ITEM_COMMON_FIELDS:
 *
 * Common fields used for all items.
 */
#define XSLT_ITEM_COMMON_FIELDS \
    XSLT_ITEM_COMPATIBILITY_FIELDS \
    XSLT_ITEM_NAVIGATION_FIELDS \
    XSLT_ITEM_NSINSCOPE_FIELDS

/**
 * _xsltStylePreComp: 
 *
 * The abstract basic structure for items of the XSLT processor.
 * This includes:
 * 1) compiled forms of XSLT instructions (e.g. xsl:if, xsl:attribute, etc.)
 * 2) compiled forms of literal result elements
 * 3) various properties for XSLT instructions (e.g. xsl:when,
 *    xsl:with-param)
 *
 * REVISIT TODO: Keep this structure equal to the fields
 *   defined by XSLT_ITEM_COMMON_FIELDS
 */
struct _xsltStylePreComp {
    xsltElemPreCompPtr next;    /* next item in the global chained
				   list hold by xsltStylesheet */
    xsltStyleType type;         /* type of the item */ 
    xsltTransformFunction func; /* handling function */
    xmlNodePtr inst;		/* the node in the stylesheet's tree
				   corresponding to this item. */
    /* Currently no navigational fields. */
    xsltNsListContainerPtr inScopeNs;
};

/**
 * xsltStyleBasicEmptyItem:
 * 
 * Abstract structure only used as a short-cut for
 * XSLT items with no extra fields.
 * NOTE that it is intended that this structure looks the same as
 *  _xsltStylePreComp.
 */
typedef struct _xsltStyleBasicEmptyItem xsltStyleBasicEmptyItem;
typedef xsltStyleBasicEmptyItem *xsltStyleBasicEmptyItemPtr;

struct _xsltStyleBasicEmptyItem {
    XSLT_ITEM_COMMON_FIELDS
};

/**
 * xsltStyleBasicExpressionItem:
 * 
 * Abstract structure only used as a short-cut for
 * XSLT items with just an expression.
 */
typedef struct _xsltStyleBasicExpressionItem xsltStyleBasicExpressionItem;
typedef xsltStyleBasicExpressionItem *xsltStyleBasicExpressionItemPtr;

struct _xsltStyleBasicExpressionItem {
    XSLT_ITEM_COMMON_FIELDS

    const xmlChar *select; /* TODO: Change this to "expression". */
    xmlXPathCompExprPtr comp; /* TODO: Change this to compExpr. */
};

/************************************************************************
 *									*
 * XSLT-instructions/declarations                                       *
 *									*
 ************************************************************************/

/**
 * xsltStyleItemElement:
 * 
 * <!-- Category: instruction -->
 * <xsl:element
 *  name = { qname }
 *  namespace = { uri-reference }
 *  use-attribute-sets = qnames>
 *  <!-- Content: template -->
 * </xsl:element>
 */
typedef struct _xsltStyleItemElement xsltStyleItemElement;
typedef xsltStyleItemElement *xsltStyleItemElementPtr;

struct _xsltStyleItemElement {
    XSLT_ITEM_COMMON_FIELDS 

    const xmlChar *use;
    int      has_use;
    const xmlChar *name;    
    int      has_name;
    const xmlChar *ns;
    const xmlChar *nsPrefix;
    int      has_ns;
};

/**
 * xsltStyleItemAttribute:
 *
 * <!-- Category: instruction -->
 * <xsl:attribute
 *  name = { qname }
 *  namespace = { uri-reference }>
 *  <!-- Content: template -->
 * </xsl:attribute>
 */
typedef struct _xsltStyleItemAttribute xsltStyleItemAttribute;
typedef xsltStyleItemAttribute *xsltStyleItemAttributePtr;

struct _xsltStyleItemAttribute {
    XSLT_ITEM_COMMON_FIELDS
    const xmlChar *name;
    int      has_name;
    const xmlChar *ns;
    const xmlChar *nsPrefix;
    int      has_ns;
};

/**
 * xsltStyleItemText:
 *
 * <!-- Category: instruction -->
 * <xsl:text
 *  disable-output-escaping = "yes" | "no">
 *  <!-- Content: #PCDATA -->
 * </xsl:text>
 */
typedef struct _xsltStyleItemText xsltStyleItemText;
typedef xsltStyleItemText *xsltStyleItemTextPtr;

struct _xsltStyleItemText {
    XSLT_ITEM_COMMON_FIELDS
    int      noescape;		/* text */
};

/**
 * xsltStyleItemComment:
 *
 * <!-- Category: instruction -->
 *  <xsl:comment>
 *  <!-- Content: template -->
 * </xsl:comment>
 */
typedef xsltStyleBasicEmptyItem xsltStyleItemComment;
typedef xsltStyleItemComment *xsltStyleItemCommentPtr;

/**
 * xsltStyleItemPI:
 *
 * <!-- Category: instruction -->
 *  <xsl:processing-instruction
 *  name = { ncname }>
 *  <!-- Content: template -->
 * </xsl:processing-instruction>
 */
typedef struct _xsltStyleItemPI xsltStyleItemPI;
typedef xsltStyleItemPI *xsltStyleItemPIPtr;

struct _xsltStyleItemPI {
    XSLT_ITEM_COMMON_FIELDS
    const xmlChar *name;
    int      has_name;
};

/**
 * xsltStyleItemApplyImports:
 *
 * <!-- Category: instruction -->
 * <xsl:apply-imports />
 */
typedef xsltStyleBasicEmptyItem xsltStyleItemApplyImports;
typedef xsltStyleItemApplyImports *xsltStyleItemApplyImportsPtr;

/**
 * xsltStyleItemApplyTemplates:
 *
 * <!-- Category: instruction -->
 *  <xsl:apply-templates
 *  select = node-set-expression
 *  mode = qname>
 *  <!-- Content: (xsl:sort | xsl:with-param)* -->
 * </xsl:apply-templates>
 */
typedef struct _xsltStyleItemApplyTemplates xsltStyleItemApplyTemplates;
typedef xsltStyleItemApplyTemplates *xsltStyleItemApplyTemplatesPtr;

struct _xsltStyleItemApplyTemplates {
    XSLT_ITEM_COMMON_FIELDS

    const xmlChar *mode;	/* apply-templates */
    const xmlChar *modeURI;	/* apply-templates */
    const xmlChar *select;	/* sort, copy-of, value-of, apply-templates */
    xmlXPathCompExprPtr comp;	/* a precompiled XPath expression */
    /* TODO: with-params */
};

/**
 * xsltStyleItemCallTemplate:
 *
 * <!-- Category: instruction -->
 *  <xsl:call-template
 *  name = qname>
 *  <!-- Content: xsl:with-param* -->
 * </xsl:call-template>
 */
typedef struct _xsltStyleItemCallTemplate xsltStyleItemCallTemplate;
typedef xsltStyleItemCallTemplate *xsltStyleItemCallTemplatePtr;

struct _xsltStyleItemCallTemplate {
    XSLT_ITEM_COMMON_FIELDS

    xsltTemplatePtr templ;	/* call-template */
    const xmlChar *name;	/* element, attribute, pi */
    int      has_name;		/* element, attribute, pi */
    const xmlChar *ns;		/* element */
    int      has_ns;		/* element */
    /* TODO: with-params */
};

/**
 * xsltStyleItemCopy:
 *
 * <!-- Category: instruction -->
 * <xsl:copy
 *  use-attribute-sets = qnames>
 *  <!-- Content: template -->
 * </xsl:copy>
 */
typedef struct _xsltStyleItemCopy xsltStyleItemCopy;
typedef xsltStyleItemCopy *xsltStyleItemCopyPtr;

struct _xsltStyleItemCopy {
   XSLT_ITEM_COMMON_FIELDS
    const xmlChar *use;		/* copy, element */
    int      has_use;		/* copy, element */    
};

/**
 * xsltStyleItemIf:
 *
 * <!-- Category: instruction -->
 *  <xsl:if
 *  test = boolean-expression>
 *  <!-- Content: template -->
 * </xsl:if>
 */
typedef struct _xsltStyleItemIf xsltStyleItemIf;
typedef xsltStyleItemIf *xsltStyleItemIfPtr;

struct _xsltStyleItemIf {
    XSLT_ITEM_COMMON_FIELDS

    const xmlChar *test;	/* if */
    xmlXPathCompExprPtr comp;	/* a precompiled XPath expression */
};


/**
 * xsltStyleItemCopyOf:
 *
 * <!-- Category: instruction -->
 * <xsl:copy-of
 *  select = expression />
 */
typedef xsltStyleBasicExpressionItem xsltStyleItemCopyOf;
typedef xsltStyleItemCopyOf *xsltStyleItemCopyOfPtr;

/**
 * xsltStyleItemValueOf:
 *
 * <!-- Category: instruction -->
 * <xsl:value-of
 *  select = string-expression
 *  disable-output-escaping = "yes" | "no" />
 */
typedef struct _xsltStyleItemValueOf xsltStyleItemValueOf;
typedef xsltStyleItemValueOf *xsltStyleItemValueOfPtr;

struct _xsltStyleItemValueOf {
    XSLT_ITEM_COMMON_FIELDS

    const xmlChar *select;
    xmlXPathCompExprPtr comp;	/* a precompiled XPath expression */
    int      noescape;
};

/**
 * xsltStyleItemNumber:
 *
 * <!-- Category: instruction -->
 *  <xsl:number
 *  level = "single" | "multiple" | "any"
 *  count = pattern
 *  from = pattern
 *  value = number-expression
 *  format = { string }
 *  lang = { nmtoken }
 *  letter-value = { "alphabetic" | "traditional" }
 *  grouping-separator = { char }
 *  grouping-size = { number } />
 */
typedef struct _xsltStyleItemNumber xsltStyleItemNumber;
typedef xsltStyleItemNumber *xsltStyleItemNumberPtr;

struct _xsltStyleItemNumber {
    XSLT_ITEM_COMMON_FIELDS
    xsltNumberData numdata;	/* number */
};

/**
 * xsltStyleItemChoose:
 *
 * <!-- Category: instruction -->
 *  <xsl:choose>
 *  <!-- Content: (xsl:when+, xsl:otherwise?) -->
 * </xsl:choose>
 */
typedef xsltStyleBasicEmptyItem xsltStyleItemChoose;
typedef xsltStyleItemChoose *xsltStyleItemChoosePtr;

/**
 * xsltStyleItemFallback:
 *
 * <!-- Category: instruction -->
 *  <xsl:fallback>
 *  <!-- Content: template -->
 * </xsl:fallback>
 */
typedef xsltStyleBasicEmptyItem xsltStyleItemFallback;
typedef xsltStyleItemFallback *xsltStyleItemFallbackPtr;

/**
 * xsltStyleItemForEach:
 *
 * <!-- Category: instruction -->
 * <xsl:for-each
 *   select = node-set-expression>
 *   <!-- Content: (xsl:sort*, template) -->
 * </xsl:for-each>
 */
typedef xsltStyleBasicExpressionItem xsltStyleItemForEach;
typedef xsltStyleItemForEach *xsltStyleItemForEachPtr;

/**
 * xsltStyleItemMessage:
 *
 * <!-- Category: instruction -->
 * <xsl:message
 *   terminate = "yes" | "no">
 *   <!-- Content: template -->
 * </xsl:message>
 */
typedef struct _xsltStyleItemMessage xsltStyleItemMessage;
typedef xsltStyleItemMessage *xsltStyleItemMessagePtr;

struct _xsltStyleItemMessage {
    XSLT_ITEM_COMMON_FIELDS    
    int terminate;
};

/**
 * xsltStyleItemDocument:
 *
 * NOTE: This is not an instruction of XSLT 1.0.
 */
typedef struct _xsltStyleItemDocument xsltStyleItemDocument;
typedef xsltStyleItemDocument *xsltStyleItemDocumentPtr;

struct _xsltStyleItemDocument {
    XSLT_ITEM_COMMON_FIELDS
    int      ver11;		/* assigned: in xsltDocumentComp;
                                  read: nowhere;
                                  TODO: Check if we need. */
    const xmlChar *filename;	/* document URL */
    int has_filename;
};   

/************************************************************************
 *									*
 * Non-instructions (actually properties of instructions/declarations)  *
 *									*
 ************************************************************************/

/**
 * xsltStyleBasicItemVariable:
 *
 * Basic struct for xsl:variable, xsl:param and xsl:with-param.
 * It's currently important to have equal fields, since
 * xsltParseStylesheetCallerParam() is used with xsl:with-param from
 * the xslt side and with xsl:param from the exslt side (in
 * exsltFuncFunctionFunction()).
 *
 * FUTURE NOTE: In XSLT 2.0 xsl:param, xsl:variable and xsl:with-param
 *   have additional different fields.
 */
typedef struct _xsltStyleBasicItemVariable xsltStyleBasicItemVariable;
typedef xsltStyleBasicItemVariable *xsltStyleBasicItemVariablePtr;

struct _xsltStyleBasicItemVariable {
    XSLT_ITEM_COMMON_FIELDS

    const xmlChar *select;
    xmlXPathCompExprPtr comp;

    const xmlChar *name;
    int      has_name;
    const xmlChar *ns;
    int      has_ns;
};

/**
 * xsltStyleItemVariable:
 *
 * <!-- Category: top-level-element -->
 * <xsl:param
 *   name = qname
 *   select = expression>
 *   <!-- Content: template -->
 * </xsl:param>
 */
typedef xsltStyleBasicItemVariable xsltStyleItemVariable;
typedef xsltStyleItemVariable *xsltStyleItemVariablePtr;

/**
 * xsltStyleItemParam:
 *
 * <!-- Category: top-level-element -->
 * <xsl:param
 *   name = qname
 *   select = expression>
 *   <!-- Content: template -->
 * </xsl:param>
 */
typedef struct _xsltStyleItemParam xsltStyleItemParam;
typedef xsltStyleItemParam *xsltStyleItemParamPtr;

struct _xsltStyleItemParam {
    XSLT_ITEM_COMMON_FIELDS

    const xmlChar *select;
    xmlXPathCompExprPtr comp;

    const xmlChar *name;
    int      has_name;
    const xmlChar *ns;
    int      has_ns;    
};

/**
 * xsltStyleItemWithParam:
 *
 * <xsl:with-param
 *  name = qname
 *  select = expression>
 *  <!-- Content: template -->
 * </xsl:with-param>
 */
typedef xsltStyleBasicItemVariable xsltStyleItemWithParam;
typedef xsltStyleItemWithParam *xsltStyleItemWithParamPtr;

/**
 * xsltStyleItemSort:
 *
 * Reflects the XSLT xsl:sort item.
 * Allowed parents: xsl:apply-templates, xsl:for-each
 * <xsl:sort
 *   select = string-expression
 *   lang = { nmtoken }
 *   data-type = { "text" | "number" | qname-but-not-ncname }
 *   order = { "ascending" | "descending" }
 *   case-order = { "upper-first" | "lower-first" } />
 */
typedef struct _xsltStyleItemSort xsltStyleItemSort;
typedef xsltStyleItemSort *xsltStyleItemSortPtr;

struct _xsltStyleItemSort {
    XSLT_ITEM_COMMON_FIELDS

    const xmlChar *stype;       /* sort */
    int      has_stype;		/* sort */
    int      number;		/* sort */
    const xmlChar *order;	/* sort */
    int      has_order;		/* sort */
    int      descending;	/* sort */
    const xmlChar *lang;	/* sort */
    int      has_lang;		/* sort */
    xsltLocale locale;		/* sort */
    const xmlChar *case_order;	/* sort */
    int      lower_first;	/* sort */

    const xmlChar *use;
    int      has_use;

    const xmlChar *select;	/* sort, copy-of, value-of, apply-templates */

    xmlXPathCompExprPtr comp;	/* a precompiled XPath expression */
};


/**
 * xsltStyleItemWhen:
 * 
 * <xsl:when
 *   test = boolean-expression>
 *   <!-- Content: template -->
 * </xsl:when>
 * Allowed parent: xsl:choose
 */
typedef struct _xsltStyleItemWhen xsltStyleItemWhen;
typedef xsltStyleItemWhen *xsltStyleItemWhenPtr;

struct _xsltStyleItemWhen {
    XSLT_ITEM_COMMON_FIELDS

    const xmlChar *test;
    xmlXPathCompExprPtr comp;
};

/**
 * xsltStyleItemOtherwise:
 *
 * Allowed parent: xsl:choose
 * <xsl:otherwise>
 *   <!-- Content: template -->
 * </xsl:otherwise>
 */
typedef struct _xsltStyleItemOtherwise xsltStyleItemOtherwise;
typedef xsltStyleItemOtherwise *xsltStyleItemOtherwisePtr;

struct _xsltStyleItemOtherwise {
    XSLT_ITEM_COMMON_FIELDS
};

typedef struct _xsltStyleItemInclude xsltStyleItemInclude;
typedef xsltStyleItemInclude *xsltStyleItemIncludePtr;

struct _xsltStyleItemInclude {
    XSLT_ITEM_COMMON_FIELDS
    xsltDocumentPtr include;
};

/************************************************************************
 *									*
 *  XSLT elements in forwards-compatible mode                           *
 *									*
 ************************************************************************/

typedef struct _xsltStyleItemUknown xsltStyleItemUknown;
typedef xsltStyleItemUknown *xsltStyleItemUknownPtr;
struct _xsltStyleItemUknown {
    XSLT_ITEM_COMMON_FIELDS
};


/************************************************************************
 *									*
 *  Extension elements                                                  *
 *									*
 ************************************************************************/

/*
 * xsltStyleItemExtElement:
 *
 * Reflects extension elements.
 *
 * NOTE: Due to the fact that the structure xsltElemPreComp is most
 * probably already heavily in use out there by users, so we cannot
 * easily change it, we'll create an intermediate structure which will
 * hold an xsltElemPreCompPtr.
 * BIG NOTE: The only problem I see here is that the user processes the
 *  content of the stylesheet tree, possibly he'll lookup the node->psvi
 *  fields in order to find subsequent extension functions.
 *  In this case, the user's code will break, since the node->psvi
 *  field will hold now the xsltStyleItemExtElementPtr and not
 *  the xsltElemPreCompPtr.
 *  However the place where the structure is anchored in the node-tree,
 *  namely node->psvi, has beed already once been moved from node->_private
 *  to node->psvi, so we have a precedent here, which, I think, should allow
 *  us to change such semantics without headaches.
 */
typedef struct _xsltStyleItemExtElement xsltStyleItemExtElement;
typedef xsltStyleItemExtElement *xsltStyleItemExtElementPtr;
struct _xsltStyleItemExtElement {
    XSLT_ITEM_COMMON_FIELDS
    xsltElemPreCompPtr item;   
};

/************************************************************************
 *									*
 *  Literal result elements                                             *
 *									*
 ************************************************************************/

typedef struct _xsltEffectiveNs xsltEffectiveNs;
typedef xsltEffectiveNs *xsltEffectiveNsPtr;
struct _xsltEffectiveNs {
    xsltEffectiveNsPtr nextInStore; /* storage next */
    xsltEffectiveNsPtr next; /* next item in the list */
    const xmlChar *prefix;
    const xmlChar *nsName;
    /* 
    * Indicates if eclared on the literal result element; dunno if really
    * needed.
    */
    int holdByElem;
};

/*
 * Info for literal result elements.
 * This will be set on the elem->psvi field and will be
 * shared by literal result elements, which have the same
 * excluded result namespaces; i.e., this *won't* be created uniquely
 * for every literal result element.
 */
typedef struct _xsltStyleItemLRElementInfo xsltStyleItemLRElementInfo;
typedef xsltStyleItemLRElementInfo *xsltStyleItemLRElementInfoPtr;
struct _xsltStyleItemLRElementInfo {
    XSLT_ITEM_COMMON_FIELDS
    /*
    * @effectiveNs is the set of effective ns-nodes
    *  on the literal result element, which will be added to the result
    *  element if not already existing in the result tree.
    *  This means that excluded namespaces (via exclude-result-prefixes,
    *  extension-element-prefixes and the XSLT namespace) not added
    *  to the set.
    *  Namespace-aliasing was applied on the @effectiveNs.
    */
    xsltEffectiveNsPtr effectiveNs;

};

#ifdef XSLT_REFACTORED

typedef struct _xsltNsAlias xsltNsAlias;
typedef xsltNsAlias *xsltNsAliasPtr;
struct _xsltNsAlias {
    xsltNsAliasPtr next; /* next in the list */    
    xmlNsPtr literalNs;
    xmlNsPtr targetNs;
    xmlDocPtr docOfTargetNs;
};
#endif

#ifdef XSLT_REFACTORED_XSLT_NSCOMP

typedef struct _xsltNsMap xsltNsMap;
typedef xsltNsMap *xsltNsMapPtr;
struct _xsltNsMap {
    xsltNsMapPtr next; /* next in the list */
    xmlDocPtr doc;
    xmlNodePtr elem; /* the element holding the ns-decl */
    xmlNsPtr ns; /* the xmlNs structure holding the XML namespace name */
    const xmlChar *origNsName; /* the original XML namespace name */
    const xmlChar *newNsName; /* the mapped XML namespace name */    
};
#endif

/************************************************************************
 *									*
 *  Compile-time structures for *internal* use only                     *
 *									*
 ************************************************************************/

typedef struct _xsltPrincipalStylesheetData xsltPrincipalStylesheetData;
typedef xsltPrincipalStylesheetData *xsltPrincipalStylesheetDataPtr;

typedef struct _xsltNsList xsltNsList;
typedef xsltNsList *xsltNsListPtr;
struct _xsltNsList {
    xsltNsListPtr next; /* next in the list */
    xmlNsPtr ns;
};

/*
* xsltVarInfo:
*
* Used at compilation time for parameters and variables.
*/
typedef struct _xsltVarInfo xsltVarInfo;
typedef xsltVarInfo *xsltVarInfoPtr;
struct _xsltVarInfo {
    xsltVarInfoPtr next; /* next in the list */
    xsltVarInfoPtr prev;
    int depth; /* the depth in the tree */
    const xmlChar *name;
    const xmlChar *nsName;
};

/**
 * xsltCompilerNodeInfo:
 *
 * Per-node information during compile-time.
 */
typedef struct _xsltCompilerNodeInfo xsltCompilerNodeInfo;
typedef xsltCompilerNodeInfo *xsltCompilerNodeInfoPtr;
struct _xsltCompilerNodeInfo {
    xsltCompilerNodeInfoPtr next;
    xsltCompilerNodeInfoPtr prev;
    xmlNodePtr node;
    int depth;
    xsltTemplatePtr templ;   /* The owning template */
    int category;	     /* XSLT element, LR-element or
                                extension element */
    xsltStyleType type;
    xsltElemPreCompPtr item; /* The compiled information */
    /* The current in-scope namespaces */
    xsltNsListContainerPtr inScopeNs;
    /* The current excluded result namespaces */
    xsltPointerListPtr exclResultNs; 
    /* The current extension instruction namespaces */
    xsltPointerListPtr extElemNs;

    /* The current info for literal result elements. */
    xsltStyleItemLRElementInfoPtr litResElemInfo;
    /* 
    * Set to 1 if in-scope namespaces changed,
    *  or excluded result namespaces changed,
    *  or extension element namespaces changed.
    * This will trigger creation of new infos
    *  for literal result elements.
    */
    int nsChanged;
    int preserveWhitespace;
    int stripWhitespace;
    int isRoot; /* whether this is the stylesheet's root node */
    int forwardsCompat; /* whether forwards-compatible mode is enabled */
    /* whether the content of an extension element was processed */
    int extContentHandled;
    /* the type of the current child */
    xsltStyleType curChildType;    
};

/**
 * XSLT_CCTXT:
 *
 * get pointer to compiler context
 */
#define XSLT_CCTXT(style) ((xsltCompilerCtxtPtr) style->compCtxt) 

typedef enum {
    XSLT_ERROR_SEVERITY_ERROR = 0,
    XSLT_ERROR_SEVERITY_WARNING
} xsltErrorSeverityType;

typedef struct _xsltCompilerCtxt xsltCompilerCtxt;
typedef xsltCompilerCtxt *xsltCompilerCtxtPtr;
struct _xsltCompilerCtxt {
    void *errorCtxt;            /* user specific error context */
    /*
    * used for error/warning reports; e.g. XSLT_ERROR_SEVERITY_WARNING */
    xsltErrorSeverityType errSeverity;		
    int warnings;		/* TODO: number of warnings found at
                                   compilation */
    int errors;			/* TODO: number of errors found at
                                   compilation */
    xmlDictPtr dict;
    xsltStylesheetPtr style;
    int simplified; /* whether this is a simplified stylesheet */
    /* TODO: structured/unstructured error contexts. */
    int depth; /* Current depth of processing */
    
    xsltCompilerNodeInfoPtr inode;
    xsltCompilerNodeInfoPtr inodeList;
    xsltCompilerNodeInfoPtr inodeLast;
    xsltPointerListPtr tmpList; /* Used for various purposes */
    /*
    * The XSLT version as specified by the stylesheet's root element.
    */
    int isInclude;
    int hasForwardsCompat; /* whether forwards-compatible mode was used
			     in a parsing episode */
    int maxNodeInfos; /* TEMP TODO: just for the interest */
    int maxLREs;  /* TEMP TODO: just for the interest */
    /* 
    * In order to keep the old behaviour, applying strict rules of
    * the spec can be turned off. This has effect only on special
    * mechanisms like whitespace-stripping in the stylesheet.
    */
    int strict;
    xsltPrincipalStylesheetDataPtr psData;
#ifdef XSLT_REFACTORED_XPATHCOMP
    xmlXPathContextPtr xpathCtxt;
#endif
    xsltStyleItemUknownPtr unknownItem;
    int hasNsAliases; /* Indicator if there was an xsl:namespace-alias. */
    xsltNsAliasPtr nsAliases;
    xsltVarInfoPtr ivars; /* Storage of local in-scope variables/params. */
    xsltVarInfoPtr ivar; /* topmost local variable/param. */
};   

#else /* XSLT_REFACTORED */
/*
* The old structures before refactoring.
*/

/**
 * _xsltStylePreComp:
 *
 * The in-memory structure corresponding to XSLT stylesheet constructs
 * precomputed data.
 */
struct _xsltStylePreComp {
    xsltElemPreCompPtr next;	/* chained list */
    xsltStyleType type;		/* type of the element */
    xsltTransformFunction func; /* handling function */
    xmlNodePtr inst;		/* the instruction */

    /*
     * Pre computed values.
     */

    const xmlChar *stype;       /* sort */
    int      has_stype;		/* sort */
    int      number;		/* sort */
    const xmlChar *order;	/* sort */
    int      has_order;		/* sort */
    int      descending;	/* sort */
    const xmlChar *lang;	/* sort */
    int      has_lang;		/* sort */
    xsltLocale locale;		/* sort */
    const xmlChar *case_order;	/* sort */
    int      lower_first;	/* sort */

    const xmlChar *use;		/* copy, element */
    int      has_use;		/* copy, element */

    int      noescape;		/* text */

    const xmlChar *name;	/* element, attribute, pi */
    int      has_name;		/* element, attribute, pi */
    const xmlChar *ns;		/* element */
    int      has_ns;		/* element */

    const xmlChar *mode;	/* apply-templates */
    const xmlChar *modeURI;	/* apply-templates */

    const xmlChar *test;	/* if */

    xsltTemplatePtr templ;	/* call-template */

    const xmlChar *select;	/* sort, copy-of, value-of, apply-templates */

    int      ver11;		/* document */
    const xmlChar *filename;	/* document URL */
    int      has_filename;	/* document */

    xsltNumberData numdata;	/* number */

    xmlXPathCompExprPtr comp;	/* a precompiled XPath expression */
    xmlNsPtr *nsList;		/* the namespaces in scope */
    int nsNr;			/* the number of namespaces in scope */
};

#endif /* XSLT_REFACTORED */


/*
 * The in-memory structure corresponding to an XSLT Variable
 * or Param.
 */
typedef struct _xsltStackElem xsltStackElem;
typedef xsltStackElem *xsltStackElemPtr;
struct _xsltStackElem {
    struct _xsltStackElem *next;/* chained list */
    xsltStylePreCompPtr comp;   /* the compiled form */
    int computed;		/* was the evaluation done */
    const xmlChar *name;	/* the local part of the name QName */
    const xmlChar *nameURI;	/* the URI part of the name QName */
    const xmlChar *select;	/* the eval string */
    xmlNodePtr tree;		/* the sequence constructor if no eval
				    string or the location */
    xmlXPathObjectPtr value;	/* The value if computed */
    xmlDocPtr fragment;		/* The Result Tree Fragments (needed for XSLT 1.0)
				   which are bound to the variable's lifetime. */
    int level;                  /* the depth in the tree;
                                   -1 if persistent (e.g. a given xsl:with-param) */
    xsltTransformContextPtr context; /* The transformation context; needed to cache
                                        the variables */
    int flags;
};

#ifdef XSLT_REFACTORED

struct _xsltPrincipalStylesheetData {
    /*
    * Namespace dictionary for ns-prefixes and ns-names:
    * TODO: Shared between stylesheets, and XPath mechanisms.
    *   Not used yet.
    */
    xmlDictPtr namespaceDict;
    /*
    * Global list of in-scope namespaces.
    */
    xsltPointerListPtr inScopeNamespaces;
    /*
    * Global list of information for [xsl:]excluded-result-prefixes.
    */
    xsltPointerListPtr exclResultNamespaces;
    /*
    * Global list of information for [xsl:]extension-element-prefixes.
    */
    xsltPointerListPtr extElemNamespaces;
    xsltEffectiveNsPtr effectiveNs;
#ifdef XSLT_REFACTORED_XSLT_NSCOMP
    /*
    * Namespace name map to get rid of string comparison of namespace names.
    */
    xsltNsMapPtr nsMap;
#endif
};

    
#endif
/*
 * Note that we added a @compCtxt field to anchor an stylesheet compilation
 * context, since, due to historical reasons, various compile-time function
 * take only the stylesheet as argument and not a compilation context.
 */
struct _xsltStylesheet {
    /*
     * The stylesheet import relation is kept as a tree.
     */
    struct _xsltStylesheet *parent;
    struct _xsltStylesheet *next;
    struct _xsltStylesheet *imports;

    xsltDocumentPtr docList;		/* the include document list */

    /*
     * General data on the style sheet document.
     */
    xmlDocPtr doc;		/* the parsed XML stylesheet */
    xmlHashTablePtr stripSpaces;/* the hash table of the strip-space and
				   preserve space elements */
    int             stripAll;	/* strip-space * (1) preserve-space * (-1) */
    xmlHashTablePtr cdataSection;/* the hash table of the cdata-section */

    /*
     * Global variable or parameters.
     */
    xsltStackElemPtr variables; /* linked list of param and variables */

    /*
     * Template descriptions.
     */
    xsltTemplatePtr templates;	/* the ordered list of templates */
    void *templatesHash;	/* hash table or wherever compiled templates
				   informations are stored */
    void *rootMatch;		/* template based on / */
    void *keyMatch;		/* template based on key() */
    void *elemMatch;		/* template based on * */
    void *attrMatch;		/* template based on @* */
    void *parentMatch;		/* template based on .. */
    void *textMatch;		/* template based on text() */
    void *piMatch;		/* template based on processing-instruction() */
    void *commentMatch;		/* template based on comment() */
    
    /*
     * Namespace aliases.
     * NOTE: Not used in the refactored code.
     */
    xmlHashTablePtr nsAliases;	/* the namespace alias hash tables */

    /*
     * Attribute sets.
     */
    xmlHashTablePtr attributeSets;/* the attribute sets hash tables */

    /*
     * Namespaces.
     * TODO: Eliminate this.
     */
    xmlHashTablePtr nsHash;     /* the set of namespaces in use:
                                   ATTENTION: This is used for
                                   execution of XPath expressions; unfortunately
                                   it restricts the stylesheet to have distinct
                                   prefixes.
				   TODO: We need to get rid of this.    
				 */
    void           *nsDefs;     /* ATTENTION TODO: This is currently used to store
				   xsltExtDefPtr (in extensions.c) and
                                   *not* xmlNsPtr.
				 */

    /*
     * Key definitions.
     */
    void *keys;			/* key definitions */

    /*
     * Output related stuff.
     */
    xmlChar *method;		/* the output method */
    xmlChar *methodURI;		/* associated namespace if any */
    xmlChar *version;		/* version string */
    xmlChar *encoding;		/* encoding string */
    int omitXmlDeclaration;     /* omit-xml-declaration = "yes" | "no" */

    /* 
     * Number formatting.
     */
    xsltDecimalFormatPtr decimalFormat;
    int standalone;             /* standalone = "yes" | "no" */
    xmlChar *doctypePublic;     /* doctype-public string */
    xmlChar *doctypeSystem;     /* doctype-system string */
    int indent;			/* should output being indented */
    xmlChar *mediaType;		/* media-type string */

    /*
     * Precomputed blocks.
     */
    xsltElemPreCompPtr preComps;/* list of precomputed blocks */
    int warnings;		/* number of warnings found at compilation */
    int errors;			/* number of errors found at compilation */

    xmlChar  *exclPrefix;	/* last excluded prefixes */
    xmlChar **exclPrefixTab;	/* array of excluded prefixes */
    int       exclPrefixNr;	/* number of excluded prefixes in scope */
    int       exclPrefixMax;	/* size of the array */

    void     *_private;		/* user defined data */

    /*
     * Extensions.
     */
    xmlHashTablePtr extInfos;	/* the extension data */
    int		    extrasNr;	/* the number of extras required */

    /*
     * For keeping track of nested includes
     */
    xsltDocumentPtr includes;	/* points to last nested include */

    /*
     * dictionary: shared between stylesheet, context and documents.
     */
    xmlDictPtr dict;
    /*
     * precompiled attribute value templates.
     */
    void *attVTs;
    /*
     * if namespace-alias has an alias for the default stylesheet prefix
     * NOTE: Not used in the refactored code.
     */
    const xmlChar *defaultAlias;
    /*
     * bypass pre-processing (already done) (used in imports)
     */
    int nopreproc;
    /*
     * all document text strings were internalized
     */
    int internalized;
    /*
     * Literal Result Element as Stylesheet c.f. section 2.3
     */
    int literal_result;
    /*
    * The principal stylesheet
    */
    xsltStylesheetPtr principal;
#ifdef XSLT_REFACTORED
    /*
    * Compilation context used during compile-time.
    */
    xsltCompilerCtxtPtr compCtxt; /* TODO: Change this to (void *). */

    xsltPrincipalStylesheetDataPtr principalData;    
#endif
};

typedef struct _xsltTransformCache xsltTransformCache;
typedef xsltTransformCache *xsltTransformCachePtr;
struct _xsltTransformCache {
    xmlDocPtr RVT;
    int nbRVT;
    xsltStackElemPtr stackItems;
    int nbStackItems;
#ifdef XSLT_DEBUG_PROFILE_CACHE
    int dbgCachedRVTs;
    int dbgReusedRVTs;
    int dbgCachedVars;
    int dbgReusedVars;
#endif
};

/*
 * The in-memory structure corresponding to an XSLT Transformation.
 */
typedef enum {
    XSLT_OUTPUT_XML = 0,
    XSLT_OUTPUT_HTML,
    XSLT_OUTPUT_TEXT
} xsltOutputType;

typedef enum {
    XSLT_STATE_OK = 0,
    XSLT_STATE_ERROR,
    XSLT_STATE_STOPPED
} xsltTransformState;

struct _xsltTransformContext {
    xsltStylesheetPtr style;		/* the stylesheet used */
    xsltOutputType type;		/* the type of output */

    xsltTemplatePtr  templ;		/* the current template */
    int              templNr;		/* Nb of templates in the stack */
    int              templMax;		/* Size of the templtes stack */
    xsltTemplatePtr *templTab;		/* the template stack */

    xsltStackElemPtr  vars;		/* the current variable list */
    int               varsNr;		/* Nb of variable list in the stack */
    int               varsMax;		/* Size of the variable list stack */
    xsltStackElemPtr *varsTab;		/* the variable list stack */
    int               varsBase;		/* the var base for current templ */

    /*
     * Extensions
     */
    xmlHashTablePtr   extFunctions;	/* the extension functions */
    xmlHashTablePtr   extElements;	/* the extension elements */
    xmlHashTablePtr   extInfos;		/* the extension data */

    const xmlChar *mode;		/* the current mode */
    const xmlChar *modeURI;		/* the current mode URI */

    xsltDocumentPtr docList;		/* the document list */

    xsltDocumentPtr document;		/* the current source document; can be NULL if an RTF */
    xmlNodePtr node;			/* the current node being processed */
    xmlNodeSetPtr nodeList;		/* the current node list */
    /* xmlNodePtr current;			the node */

    xmlDocPtr output;			/* the resulting document */
    xmlNodePtr insert;			/* the insertion node */

    xmlXPathContextPtr xpathCtxt;	/* the XPath context */
    xsltTransformState state;		/* the current state */

    /*
     * Global variables
     */
    xmlHashTablePtr   globalVars;	/* the global variables and params */

    xmlNodePtr inst;			/* the instruction in the stylesheet */

    int xinclude;			/* should XInclude be processed */

    const char *      outputFile;	/* the output URI if known */

    int profile;                        /* is this run profiled */
    long             prof;		/* the current profiled value */
    int              profNr;		/* Nb of templates in the stack */
    int              profMax;		/* Size of the templtaes stack */
    long            *profTab;		/* the profile template stack */

    void            *_private;		/* user defined data */

    int              extrasNr;		/* the number of extras used */
    int              extrasMax;		/* the number of extras allocated */
    xsltRuntimeExtraPtr extras;		/* extra per runtime informations */

    xsltDocumentPtr  styleList;		/* the stylesheet docs list */
    void                 * sec;		/* the security preferences if any */

    xmlGenericErrorFunc  error;		/* a specific error handler */
    void              * errctx;		/* context for the error handler */

    xsltSortFunc      sortfunc;		/* a ctxt specific sort routine */

    /*
     * handling of temporary Result Value Tree
     * (XSLT 1.0 term: "Result Tree Fragment")
     */
    xmlDocPtr       tmpRVT;		/* list of RVT without persistance */
    xmlDocPtr       persistRVT;		/* list of persistant RVTs */
    int             ctxtflags;          /* context processing flags */

    /*
     * Speed optimization when coalescing text nodes
     */
    const xmlChar  *lasttext;		/* last text node content */
    unsigned int    lasttsize;		/* last text node size */
    unsigned int    lasttuse;		/* last text node use */
    /*
     * Per Context Debugging
     */
    int debugStatus;			/* the context level debug status */
    unsigned long* traceCode;		/* pointer to the variable holding the mask */

    int parserOptions;			/* parser options xmlParserOption */

    /*
     * dictionary: shared between stylesheet, context and documents.
     */
    xmlDictPtr dict;
    xmlDocPtr		tmpDoc; /* Obsolete; not used in the library. */
    /*
     * all document text strings are internalized
     */
    int internalized;
    int nbKeys;
    int hasTemplKeyPatterns;
    xsltTemplatePtr currentTemplateRule; /* the Current Template Rule */
    xmlNodePtr initialContextNode;
    xmlDocPtr initialContextDoc;
    xsltTransformCachePtr cache;
    void *contextVariable; /* the current variable item */
    xmlDocPtr localRVT; /* list of local tree fragments; will be freed when
			   the instruction which created the fragment
                           exits */
    xmlDocPtr localRVTBase;
    int keyInitLevel;   /* Needed to catch recursive keys issues */
    int funcLevel;      /* Needed to catch recursive functions issues */
};

/**
 * CHECK_STOPPED:
 *
 * Macro to check if the XSLT processing should be stopped.
 * Will return from the function.
 */
#define CHECK_STOPPED if (ctxt->state == XSLT_STATE_STOPPED) return;

/**
 * CHECK_STOPPEDE:
 *
 * Macro to check if the XSLT processing should be stopped.
 * Will goto the error: label.
 */
#define CHECK_STOPPEDE if (ctxt->state == XSLT_STATE_STOPPED) goto error;

/**
 * CHECK_STOPPED0:
 *
 * Macro to check if the XSLT processing should be stopped.
 * Will return from the function with a 0 value.
 */
#define CHECK_STOPPED0 if (ctxt->state == XSLT_STATE_STOPPED) return(0);

/*
 * The macro XML_CAST_FPTR is a hack to avoid a gcc warning about
 * possible incompatibilities between function pointers and object
 * pointers.  It is defined in libxml/hash.h within recent versions
 * of libxml2, but is put here for compatibility.
 */
#ifndef XML_CAST_FPTR
/**
 * XML_CAST_FPTR:
 * @fptr:  pointer to a function
 *
 * Macro to do a casting from an object pointer to a
 * function pointer without encountering a warning from
 * gcc
 *
 * #define XML_CAST_FPTR(fptr) (*(void **)(&fptr))
 * This macro violated ISO C aliasing rules (gcc4 on s390 broke)
 * so it is disabled now
 */

#define XML_CAST_FPTR(fptr) fptr
#endif
/*
 * Functions associated to the internal types
xsltDecimalFormatPtr	xsltDecimalFormatGetByName(xsltStylesheetPtr sheet,
						   xmlChar *name);
 */
XSLTPUBFUN xsltStylesheetPtr XSLTCALL	
			xsltNewStylesheet	(void);
XSLTPUBFUN xsltStylesheetPtr XSLTCALL	
			xsltParseStylesheetFile	(const xmlChar* filename);
XSLTPUBFUN void XSLTCALL			
			xsltFreeStylesheet	(xsltStylesheetPtr style);
XSLTPUBFUN int XSLTCALL			
			xsltIsBlank		(xmlChar *str);
XSLTPUBFUN void XSLTCALL			
			xsltFreeStackElemList	(xsltStackElemPtr elem);
XSLTPUBFUN xsltDecimalFormatPtr XSLTCALL	
			xsltDecimalFormatGetByName(xsltStylesheetPtr style,
						 xmlChar *name);

XSLTPUBFUN xsltStylesheetPtr XSLTCALL	
			xsltParseStylesheetProcess(xsltStylesheetPtr ret,
						 xmlDocPtr doc);
XSLTPUBFUN void XSLTCALL			
			xsltParseStylesheetOutput(xsltStylesheetPtr style,
						 xmlNodePtr cur);
XSLTPUBFUN xsltStylesheetPtr XSLTCALL	
			xsltParseStylesheetDoc	(xmlDocPtr doc);
XSLTPUBFUN xsltStylesheetPtr XSLTCALL	
			xsltParseStylesheetImportedDoc(xmlDocPtr doc,
						xsltStylesheetPtr style);
XSLTPUBFUN xsltStylesheetPtr XSLTCALL	
			xsltLoadStylesheetPI	(xmlDocPtr doc);
XSLTPUBFUN void XSLTCALL 			
			xsltNumberFormat	(xsltTransformContextPtr ctxt,
						 xsltNumberDataPtr data,
						 xmlNodePtr node);
XSLTPUBFUN xmlXPathError XSLTCALL		 
			xsltFormatNumberConversion(xsltDecimalFormatPtr self,
						 xmlChar *format,
						 double number,
						 xmlChar **result);

XSLTPUBFUN void XSLTCALL			
			xsltParseTemplateContent(xsltStylesheetPtr style,
						 xmlNodePtr templ);
XSLTPUBFUN int XSLTCALL			
			xsltAllocateExtra	(xsltStylesheetPtr style);
XSLTPUBFUN int XSLTCALL			
			xsltAllocateExtraCtxt	(xsltTransformContextPtr ctxt);
/*
 * Extra functions for Result Value Trees
 */
XSLTPUBFUN xmlDocPtr XSLTCALL		
			xsltCreateRVT		(xsltTransformContextPtr ctxt);
XSLTPUBFUN int XSLTCALL			
			xsltRegisterTmpRVT	(xsltTransformContextPtr ctxt,
						 xmlDocPtr RVT);
XSLTPUBFUN int XSLTCALL			
			xsltRegisterLocalRVT	(xsltTransformContextPtr ctxt,
						 xmlDocPtr RVT);
XSLTPUBFUN int XSLTCALL			
			xsltRegisterPersistRVT	(xsltTransformContextPtr ctxt,
						 xmlDocPtr RVT);
XSLTPUBFUN int XSLTCALL
			xsltExtensionInstructionResultRegister(
						 xsltTransformContextPtr ctxt,
						 xmlXPathObjectPtr obj);
XSLTPUBFUN int XSLTCALL
			xsltExtensionInstructionResultFinalize(
						 xsltTransformContextPtr ctxt);
XSLTPUBFUN void XSLTCALL
			xsltFreeRVTs		(xsltTransformContextPtr ctxt);
XSLTPUBFUN void XSLTCALL
			xsltReleaseRVT		(xsltTransformContextPtr ctxt,
						 xmlDocPtr RVT);
XSLTPUBFUN int XSLTCALL
			xsltTransStorageAdd	(xsltTransformContextPtr ctxt,
						 void *id,
						 void *data);
XSLTPUBFUN void * XSLTCALL
			xsltTransStorageRemove	(xsltTransformContextPtr ctxt,
						 void *id);

/*
 * Extra functions for Attribute Value Templates
 */
XSLTPUBFUN void XSLTCALL
			xsltCompileAttr		(xsltStylesheetPtr style,
						 xmlAttrPtr attr);
XSLTPUBFUN xmlChar * XSLTCALL
			xsltEvalAVT		(xsltTransformContextPtr ctxt,
						 void *avt,
						 xmlNodePtr node);
XSLTPUBFUN void XSLTCALL
			xsltFreeAVTList		(void *avt);

/*
 * Extra function for successful xsltCleanupGlobals / xsltInit sequence.
 */

XSLTPUBFUN void XSLTCALL
			xsltUninit		(void);

/************************************************************************
 *									*
 *  Compile-time functions for *internal* use only                      *
 *									*
 ************************************************************************/

#ifdef XSLT_REFACTORED  
XSLTPUBFUN void XSLTCALL
			xsltParseSequenceConstructor(
						 xsltCompilerCtxtPtr cctxt,
						 xmlNodePtr start);
XSLTPUBFUN int XSLTCALL
			xsltParseAnyXSLTElem	(xsltCompilerCtxtPtr cctxt,
						 xmlNodePtr elem);
#ifdef XSLT_REFACTORED_XSLT_NSCOMP
XSLTPUBFUN int XSLTCALL
			xsltRestoreDocumentNamespaces(
						 xsltNsMapPtr ns,
						 xmlDocPtr doc);
#endif
#endif /* XSLT_REFACTORED */

/************************************************************************
 *									*
 *  Transformation-time functions for *internal* use only               *
 *									*
 ************************************************************************/
XSLTPUBFUN int XSLTCALL
			xsltInitCtxtKey		(xsltTransformContextPtr ctxt,
						 xsltDocumentPtr doc,
						 xsltKeyDefPtr keyd);
XSLTPUBFUN int XSLTCALL
			xsltInitAllDocKeys	(xsltTransformContextPtr ctxt);
#ifdef __cplusplus
}
#endif

#endif /* __XML_XSLT_H__ */