tree.h

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    struct _xmlNode *prev;	/* previous sibling link  */
    struct _xmlDoc  *doc;	/* the containing document */

    /* End of common part */
    xmlNs           *ns;        /* pointer to the associated namespace */
    xmlChar         *content;   /* the content */
    struct _xmlAttr *properties;/* properties list */
    xmlNs           *nsDef;     /* namespace definitions on this node */
};

/**
 * XML_GET_CONTENT:
 *
 * Macro to extract the content pointer of a node.
 */
#define XML_GET_CONTENT(n)					\
    ((n)->type == XML_ELEMENT_NODE ? NULL : (n)->content)

/**
 * XML_GET_LINE:
 *
 * Macro to extract the line number of an element node. 
 * This will work only if line numbering is activated by
 * calling xmlLineNumbersDefault(1) before parsing.
 */
#define XML_GET_LINE(n)						\
    ((n)->type == XML_ELEMENT_NODE ? (int) (n)->content : 0)

/**
 * xmlDoc:
 *
 * An XML document.
 */
typedef struct _xmlDoc xmlDoc;
typedef xmlDoc *xmlDocPtr;
struct _xmlDoc {
    void           *_private;	/* application data */
    xmlElementType  type;       /* XML_DOCUMENT_NODE, must be second ! */
    char           *name;	/* name/filename/URI of the document */
    struct _xmlNode *children;	/* the document tree */
    struct _xmlNode *last;	/* last child link */
    struct _xmlNode *parent;	/* child->parent link */
    struct _xmlNode *next;	/* next sibling link  */
    struct _xmlNode *prev;	/* previous sibling link  */
    struct _xmlDoc  *doc;	/* autoreference to itself */

    /* End of common part */
    int             compression;/* level of zlib compression */
    int             standalone; /* standalone document (no external refs) */
    struct _xmlDtd  *intSubset;	/* the document internal subset */
    struct _xmlDtd  *extSubset;	/* the document external subset */
    struct _xmlNs   *oldNs;	/* Global namespace, the old way */
    const xmlChar  *version;	/* the XML version string */
    const xmlChar  *encoding;   /* external initial encoding, if any */
    void           *ids;        /* Hash table for ID attributes if any */
    void           *refs;       /* Hash table for IDREFs attributes if any */
    const xmlChar  *URL;	/* The URI for that document */
    int             charset;    /* encoding of the in-memory content
				   actually an xmlCharEncoding */
};

/**
 * xmlChildrenNode:
 *
 * Macro for compatibility naming layer with libxml1.
 */
#ifndef xmlChildrenNode
#define xmlChildrenNode children
#endif

/**
 * xmlRootNode:
 *
 * Macro for compatibility naming layer with libxml1.
 */
#ifndef xmlRootNode
#define xmlRootNode children
#endif

/*
 * Variables.
 */
#if 0
LIBXML_DLL_IMPORT extern int oldXMLWDcompatibility;/* maintain compatibility with old WD */
LIBXML_DLL_IMPORT extern int xmlIndentTreeOutput;  /* try to indent the tree dumps */
LIBXML_DLL_IMPORT extern xmlBufferAllocationScheme xmlBufferAllocScheme; /* alloc scheme to use */
LIBXML_DLL_IMPORT extern int xmlSaveNoEmptyTags; /* save empty tags as <empty></empty> */
LIBXML_DLL_IMPORT extern int xmlDefaultBufferSize; /* default buffer size */
#endif

/*
 * Handling Buffers.
 */

void		xmlSetBufferAllocationScheme(xmlBufferAllocationScheme scheme);
xmlBufferAllocationScheme	 xmlGetBufferAllocationScheme(void);

xmlBufferPtr	xmlBufferCreate		(void);
xmlBufferPtr	xmlBufferCreateSize	(size_t size);
int		xmlBufferResize		(xmlBufferPtr buf,
					 unsigned int size);
void		xmlBufferFree		(xmlBufferPtr buf);
int		xmlBufferDump		(FILE *file,
					 xmlBufferPtr buf);
void		xmlBufferAdd		(xmlBufferPtr buf,
					 const xmlChar *str,
					 int len);
void		xmlBufferAddHead	(xmlBufferPtr buf,
					 const xmlChar *str,
					 int len);
void		xmlBufferCat		(xmlBufferPtr buf,
					 const xmlChar *str);
void		xmlBufferCCat		(xmlBufferPtr buf,
					 const char *str);
int		xmlBufferShrink		(xmlBufferPtr buf,
					 unsigned int len);
int		xmlBufferGrow		(xmlBufferPtr buf,
					 unsigned int len);
void		xmlBufferEmpty		(xmlBufferPtr buf);
const xmlChar*	xmlBufferContent	(const xmlBufferPtr buf);
void		xmlBufferSetAllocationScheme(xmlBufferPtr buf,
					 xmlBufferAllocationScheme scheme);
int		xmlBufferLength		(const xmlBufferPtr buf);

/*
 * Creating/freeing new structures.
 */
xmlDtdPtr	xmlCreateIntSubset	(xmlDocPtr doc,
					 const xmlChar *name,
					 const xmlChar *ExternalID,
					 const xmlChar *SystemID);
xmlDtdPtr	xmlNewDtd		(xmlDocPtr doc,
					 const xmlChar *name,
					 const xmlChar *ExternalID,
					 const xmlChar *SystemID);
xmlDtdPtr	xmlGetIntSubset		(xmlDocPtr doc);
void		xmlFreeDtd		(xmlDtdPtr cur);
xmlNsPtr	xmlNewGlobalNs		(xmlDocPtr doc,
					 const xmlChar *href,
					 const xmlChar *prefix);
xmlNsPtr	xmlNewNs		(xmlNodePtr node,
					 const xmlChar *href,
					 const xmlChar *prefix);
void		xmlFreeNs		(xmlNsPtr cur);
void		xmlFreeNsList		(xmlNsPtr cur);
xmlDocPtr 	xmlNewDoc		(const xmlChar *version);
void		xmlFreeDoc		(xmlDocPtr cur);
xmlAttrPtr	xmlNewDocProp		(xmlDocPtr doc,
					 const xmlChar *name,
					 const xmlChar *value);
xmlAttrPtr	xmlNewProp		(xmlNodePtr node,
					 const xmlChar *name,
					 const xmlChar *value);
xmlAttrPtr	xmlNewNsProp		(xmlNodePtr node,
					 xmlNsPtr ns,
					 const xmlChar *name,
					 const xmlChar *value);
void		xmlFreePropList		(xmlAttrPtr cur);
void		xmlFreeProp		(xmlAttrPtr cur);
xmlAttrPtr	xmlCopyProp		(xmlNodePtr target,
					 xmlAttrPtr cur);
xmlAttrPtr	xmlCopyPropList		(xmlNodePtr target,
					 xmlAttrPtr cur);
xmlDtdPtr	xmlCopyDtd		(xmlDtdPtr dtd);
xmlDocPtr	xmlCopyDoc		(xmlDocPtr doc,
					 int recursive);

/*
 * Creating new nodes.
 */
xmlNodePtr	xmlNewDocNode		(xmlDocPtr doc,
					 xmlNsPtr ns,
					 const xmlChar *name,
					 const xmlChar *content);
xmlNodePtr	xmlNewDocRawNode	(xmlDocPtr doc,
					 xmlNsPtr ns,
					 const xmlChar *name,
					 const xmlChar *content);
xmlNodePtr	xmlNewNode		(xmlNsPtr ns,
					 const xmlChar *name);
xmlNodePtr	xmlNewChild		(xmlNodePtr parent,
					 xmlNsPtr ns,
					 const xmlChar *name,
					 const xmlChar *content);
xmlNodePtr	xmlNewTextChild		(xmlNodePtr parent,
					 xmlNsPtr ns,
					 const xmlChar *name,
					 const xmlChar *content);
xmlNodePtr	xmlNewDocText		(xmlDocPtr doc,
					 const xmlChar *content);
xmlNodePtr	xmlNewText		(const xmlChar *content);
xmlNodePtr	xmlNewPI		(const xmlChar *name,
					 const xmlChar *content);
xmlNodePtr	xmlNewDocTextLen	(xmlDocPtr doc,
					 const xmlChar *content,
					 int len);
xmlNodePtr	xmlNewTextLen		(const xmlChar *content,
					 int len);
xmlNodePtr	xmlNewDocComment	(xmlDocPtr doc,
					 const xmlChar *content);
xmlNodePtr	xmlNewComment		(const xmlChar *content);
xmlNodePtr	xmlNewCDataBlock	(xmlDocPtr doc,
					 const xmlChar *content,
					 int len);
xmlNodePtr	xmlNewCharRef		(xmlDocPtr doc,
					 const xmlChar *name);
xmlNodePtr	xmlNewReference		(xmlDocPtr doc,
					 const xmlChar *name);
xmlNodePtr	xmlCopyNode		(const xmlNodePtr node,
					 int recursive);
xmlNodePtr	xmlDocCopyNode		(xmlNodePtr node,
					 xmlDocPtr doc,
					 int recursive);
xmlNodePtr	xmlCopyNodeList		(xmlNodePtr node);
xmlNodePtr	xmlNewDocFragment	(xmlDocPtr doc);

/*
 * Navigating.
 */
long		xmlGetLineNo		(xmlNodePtr node);
xmlChar *	xmlGetNodePath		(xmlNodePtr node);
xmlNodePtr	xmlDocGetRootElement	(xmlDocPtr doc);
xmlNodePtr	xmlGetLastChild		(xmlNodePtr parent);
int		xmlNodeIsText		(xmlNodePtr node);
int		xmlIsBlankNode		(xmlNodePtr node);

/*
 * Changing the structure.
 */
xmlNodePtr	xmlDocSetRootElement	(xmlDocPtr doc,
					 xmlNodePtr root);
void		xmlNodeSetName		(xmlNodePtr cur,
					 const xmlChar *name);
xmlNodePtr	xmlAddChild		(xmlNodePtr parent,
					 xmlNodePtr cur);
xmlNodePtr	xmlAddChildList		(xmlNodePtr parent,
					 xmlNodePtr cur);
xmlNodePtr	xmlReplaceNode		(xmlNodePtr old,
					 xmlNodePtr cur);
xmlNodePtr	xmlAddSibling		(xmlNodePtr cur,
					 xmlNodePtr elem);
xmlNodePtr	xmlAddPrevSibling	(xmlNodePtr cur,
					 xmlNodePtr elem);
xmlNodePtr	xmlAddNextSibling	(xmlNodePtr cur,
					 xmlNodePtr elem);
void		xmlUnlinkNode		(xmlNodePtr cur);
xmlNodePtr	xmlTextMerge		(xmlNodePtr first,
					 xmlNodePtr second);
void		xmlTextConcat		(xmlNodePtr node,
					 const xmlChar *content,
					 int len);
void		xmlFreeNodeList		(xmlNodePtr cur);
void		xmlFreeNode		(xmlNodePtr cur);
void		xmlSetTreeDoc		(xmlNodePtr tree,
					 xmlDocPtr doc);
void		xmlSetListDoc		(xmlNodePtr list,
					 xmlDocPtr doc);

/*
 * Namespaces.
 */
xmlNsPtr	xmlSearchNs		(xmlDocPtr doc,
					 xmlNodePtr node,
					 const xmlChar *nameSpace);
xmlNsPtr	xmlSearchNsByHref	(xmlDocPtr doc,
					 xmlNodePtr node,
					 const xmlChar *href);
xmlNsPtr *	xmlGetNsList		(xmlDocPtr doc,
					 xmlNodePtr node);
void		xmlSetNs		(xmlNodePtr node,
					 xmlNsPtr ns);
xmlNsPtr	xmlCopyNamespace	(xmlNsPtr cur);
xmlNsPtr	xmlCopyNamespaceList	(xmlNsPtr cur);

/*
 * Changing the content.
 */
xmlAttrPtr	xmlSetProp		(xmlNodePtr node,
					 const xmlChar *name,
					 const xmlChar *value);
xmlChar *	xmlGetProp		(xmlNodePtr node,
					 const xmlChar *name);
xmlAttrPtr	xmlHasProp		(xmlNodePtr node,
					 const xmlChar *name);
xmlAttrPtr	xmlHasNsProp		(xmlNodePtr node,
					 const xmlChar *name,
					 const xmlChar *nameSpace);
xmlAttrPtr	xmlSetNsProp		(xmlNodePtr node,
					 xmlNsPtr ns,
					 const xmlChar *name,
					 const xmlChar *value);
xmlChar *	xmlGetNsProp		(xmlNodePtr node,
					 const xmlChar *name,
					 const xmlChar *nameSpace);
xmlNodePtr	xmlStringGetNodeList	(xmlDocPtr doc,
					 const xmlChar *value);
xmlNodePtr	xmlStringLenGetNodeList	(xmlDocPtr doc,
					 const xmlChar *value,
					 int len);
xmlChar *	xmlNodeListGetString	(xmlDocPtr doc,
					 xmlNodePtr list,
					 int inLine);
xmlChar *	xmlNodeListGetRawString	(xmlDocPtr doc,
					 xmlNodePtr list,
					 int inLine);
void		xmlNodeSetContent	(xmlNodePtr cur,
					 const xmlChar *content);
void		xmlNodeSetContentLen	(xmlNodePtr cur,
					 const xmlChar *content,
					 int len);
void		xmlNodeAddContent	(xmlNodePtr cur,
					 const xmlChar *content);
void		xmlNodeAddContentLen	(xmlNodePtr cur,
					 const xmlChar *content,
					 int len);
xmlChar *	xmlNodeGetContent	(xmlNodePtr cur);
xmlChar *	xmlNodeGetLang		(xmlNodePtr cur);
void		xmlNodeSetLang		(xmlNodePtr cur,
					 const xmlChar *lang);
int		xmlNodeGetSpacePreserve	(xmlNodePtr cur);
void		xmlNodeSetSpacePreserve (xmlNodePtr cur,
					 int val);
xmlChar *	xmlNodeGetBase		(xmlDocPtr doc,
					 xmlNodePtr cur);
void		xmlNodeSetBase		(xmlNodePtr cur,
					 xmlChar *uri);

/*
 * Removing content.
 */
int		xmlRemoveProp		(xmlAttrPtr cur);
int		xmlUnsetProp		(xmlNodePtr node,
					 const xmlChar *name);
int		xmlUnsetNsProp		(xmlNodePtr node,
					 xmlNsPtr ns,
					 const xmlChar *name);

/*
 * Internal, don't use.
 */
#ifdef VMS
void		xmlBufferWriteXmlCHAR	(xmlBufferPtr buf,
					 const xmlChar *string);
#define 	xmlBufferWriteCHAR 	xmlBufferWriteXmlCHAR
#else
void		xmlBufferWriteCHAR	(xmlBufferPtr buf,
					 const xmlChar *string);
#endif
void		xmlBufferWriteChar	(xmlBufferPtr buf,
					 const char *string);
void		xmlBufferWriteQuotedString(xmlBufferPtr buf,
					 const xmlChar *string);

/*
 * Namespace handling.
 */
int		xmlReconciliateNs	(xmlDocPtr doc,
					 xmlNodePtr tree);

/*
 * Saving.
 */
void		xmlDocDumpFormatMemory	(xmlDocPtr cur,
					 xmlChar **mem,
					 int *size,
					 int format);
void		xmlDocDumpMemory	(xmlDocPtr cur,
					 xmlChar **mem,
					 int *size);
void		xmlDocDumpMemoryEnc	(xmlDocPtr out_doc,
					 xmlChar **doc_txt_ptr,
					 int * doc_txt_len,
					 const char *txt_encoding);
void		xmlDocDumpFormatMemoryEnc(xmlDocPtr out_doc,
					 xmlChar **doc_txt_ptr,
					 int * doc_txt_len,
					 const char *txt_encoding,
					 int format);
int		xmlDocDump		(FILE *f,
					 xmlDocPtr cur);
void		xmlElemDump		(FILE *f,
					 xmlDocPtr doc,
					 xmlNodePtr cur);
int		xmlSaveFile		(const char *filename,
					 xmlDocPtr cur);
int		xmlSaveFormatFile	(const char *filename,
					 xmlDocPtr cur,
					 int format);
void		xmlNodeDump		(xmlBufferPtr buf,
					 xmlDocPtr doc,
					 xmlNodePtr cur,
					 int level,
					 int format);

int		xmlSaveFileTo		(xmlOutputBufferPtr buf,
					 xmlDocPtr cur,
					 const char *encoding);
int             xmlSaveFormatFileTo     (xmlOutputBufferPtr buf,
					 xmlDocPtr cur,
				         const char *encoding,
				         int format);
void		xmlNodeDumpOutput	(xmlOutputBufferPtr buf,
					 xmlDocPtr doc,
					 xmlNodePtr cur,
					 int level,
					 int format,
					 const char *encoding);

int		xmlSaveFormatFileEnc    (const char *filename,
					 xmlDocPtr cur,
					 const char *encoding,
					 int format);

int		xmlSaveFileEnc		(const char *filename,
					 xmlDocPtr cur,
					 const char *encoding);

/*
 * Compression.
 */
int		xmlGetDocCompressMode	(xmlDocPtr doc);
void		xmlSetDocCompressMode	(xmlDocPtr doc,
					 int mode);
int		xmlGetCompressMode	(void);
void		xmlSetCompressMode	(int mode);

#ifdef __cplusplus
}
#endif
#ifndef __XML_PARSER_H__
#include <libxml/xmlmemory.h>
#endif

#endif /* __XML_TREE_H__ */