parser: the core parser module

Details

Macro XML_COMPLETE_ATTRS

#define XML_COMPLETE_ATTRS;

Bit in the loadsubset context field to tell to do complete the elements attributes lists with the ones defaulted from the DTDs. Use it to initialize xmlLoadExtDtdDefaultValue.

Macro XML_DEFAULT_VERSION

#define XML_DEFAULT_VERSION;

The default version of XML used: 1.0

Macro XML_DETECT_IDS

#define XML_DETECT_IDS;

Bit in the loadsubset context field to tell to do ID/REFs lookups. Use it to initialize xmlLoadExtDtdDefaultValue.

Macro XML_SAX2_MAGIC

#define XML_SAX2_MAGIC;

Special constant found in SAX2 blocks initialized fields

Macro XML_SKIP_IDS

#define XML_SKIP_IDS;

Bit in the loadsubset context field to tell to not do ID/REFs registration. Used to initialize xmlLoadExtDtdDefaultValue in some special cases.

Enum xmlFeature

enum xmlFeature {
    XML_WITH_THREAD = 1
    XML_WITH_TREE = 2
    XML_WITH_OUTPUT = 3
    XML_WITH_PUSH = 4
    XML_WITH_READER = 5
    XML_WITH_PATTERN = 6
    XML_WITH_WRITER = 7
    XML_WITH_SAX1 = 8
    XML_WITH_FTP = 9
    XML_WITH_HTTP = 10
    XML_WITH_VALID = 11
    XML_WITH_HTML = 12
    XML_WITH_LEGACY = 13
    XML_WITH_C14N = 14
    XML_WITH_CATALOG = 15
    XML_WITH_XPATH = 16
    XML_WITH_XPTR = 17
    XML_WITH_XINCLUDE = 18
    XML_WITH_ICONV = 19
    XML_WITH_ISO8859X = 20
    XML_WITH_UNICODE = 21
    XML_WITH_REGEXP = 22
    XML_WITH_AUTOMATA = 23
    XML_WITH_EXPR = 24
    XML_WITH_SCHEMAS = 25
    XML_WITH_SCHEMATRON = 26
    XML_WITH_MODULES = 27
    XML_WITH_DEBUG = 28
    XML_WITH_DEBUG_MEM = 29
    XML_WITH_DEBUG_RUN = 30
    XML_WITH_ZLIB = 31
    XML_WITH_ICU = 32
    XML_WITH_NONE = 99999 /*  just to be sure of allocation size */
};

Enum xmlParserInputState

enum xmlParserInputState {
    XML_PARSER_EOF = -1 /* nothing is to be parsed */
    XML_PARSER_START = 0 /* nothing has been parsed */
    XML_PARSER_MISC = 1 /* Misc* before int subset */
    XML_PARSER_PI = 2 /* Within a processing instruction */
    XML_PARSER_DTD = 3 /* within some DTD content */
    XML_PARSER_PROLOG = 4 /* Misc* after internal subset */
    XML_PARSER_COMMENT = 5 /* within a comment */
    XML_PARSER_START_TAG = 6 /* within a start tag */
    XML_PARSER_CONTENT = 7 /* within the content */
    XML_PARSER_CDATA_SECTION = 8 /* within a CDATA section */
    XML_PARSER_END_TAG = 9 /* within a closing tag */
    XML_PARSER_ENTITY_DECL = 10 /* within an entity declaration */
    XML_PARSER_ENTITY_VALUE = 11 /* within an entity value in a decl */
    XML_PARSER_ATTRIBUTE_VALUE = 12 /* within an attribute value */
    XML_PARSER_SYSTEM_LITERAL = 13 /* within a SYSTEM value */
    XML_PARSER_EPILOG = 14 /* the Misc* after the last end tag */
    XML_PARSER_IGNORE = 15 /* within an IGNORED section */
    XML_PARSER_PUBLIC_LITERAL = 16 /*  within a PUBLIC value */
};

Enum xmlParserMode

enum xmlParserMode {
    XML_PARSE_UNKNOWN = 0
    XML_PARSE_DOM = 1
    XML_PARSE_SAX = 2
    XML_PARSE_PUSH_DOM = 3
    XML_PARSE_PUSH_SAX = 4
    XML_PARSE_READER = 5
};

Structure xmlParserNodeInfo

struct _xmlParserNodeInfo {
    const struct _xmlNode *	node	: Position & line # that text that created the node begins & ends on
    unsigned long	begin_pos
    unsigned long	begin_line
    unsigned long	end_pos
    unsigned long	end_line
} xmlParserNodeInfo;

Typedef xmlParserNodeInfoPtr

xmlParserNodeInfo * xmlParserNodeInfoPtr;

Structure xmlParserNodeInfoSeq

struct _xmlParserNodeInfoSeq {
    unsigned long	maximum
    unsigned long	length
    xmlParserNodeInfo *	buffer
} xmlParserNodeInfoSeq;

Typedef xmlParserNodeInfoSeqPtr

xmlParserNodeInfoSeq * xmlParserNodeInfoSeqPtr;

Enum xmlParserOption

enum xmlParserOption {
    XML_PARSE_RECOVER = 1 /* recover on errors */
    XML_PARSE_NOENT = 2 /* substitute entities */
    XML_PARSE_DTDLOAD = 4 /* load the external subset */
    XML_PARSE_DTDATTR = 8 /* default DTD attributes */
    XML_PARSE_DTDVALID = 16 /* validate with the DTD */
    XML_PARSE_NOERROR = 32 /* suppress error reports */
    XML_PARSE_NOWARNING = 64 /* suppress warning reports */
    XML_PARSE_PEDANTIC = 128 /* pedantic error reporting */
    XML_PARSE_NOBLANKS = 256 /* remove blank nodes */
    XML_PARSE_SAX1 = 512 /* use the SAX1 interface internally */
    XML_PARSE_XINCLUDE = 1024 /* Implement XInclude substitition */
    XML_PARSE_NONET = 2048 /* Forbid network access */
    XML_PARSE_NODICT = 4096 /* Do not reuse the context dictionnary */
    XML_PARSE_NSCLEAN = 8192 /* remove redundant namespaces declarations */
    XML_PARSE_NOCDATA = 16384 /* merge CDATA as text nodes */
    XML_PARSE_NOXINCNODE = 32768 /* do not generate XINCLUDE START/END nodes */
    XML_PARSE_COMPACT = 65536 /* compact small text nodes; no modification of the tree allowed afterwards (will possibly crash if you try to modify the tree) */
    XML_PARSE_OLD10 = 131072 /* parse using XML-1.0 before update 5 */
    XML_PARSE_NOBASEFIX = 262144 /* do not fixup XINCLUDE xml:base uris */
    XML_PARSE_HUGE = 524288 /* relax any hardcoded limit from the parser */
    XML_PARSE_OLDSAX = 1048576 /*  parse using SAX2 interface from before 2.7.0 */
};

Structure xmlSAXHandlerV1

struct _xmlSAXHandlerV1 {
    internalSubsetSAXFunc	internalSubset
    isStandaloneSAXFunc	isStandalone
    hasInternalSubsetSAXFunc	hasInternalSubset
    hasExternalSubsetSAXFunc	hasExternalSubset
    resolveEntitySAXFunc	resolveEntity
    getEntitySAXFunc	getEntity
    entityDeclSAXFunc	entityDecl
    notationDeclSAXFunc	notationDecl
    attributeDeclSAXFunc	attributeDecl
    elementDeclSAXFunc	elementDecl
    unparsedEntityDeclSAXFunc	unparsedEntityDecl
    setDocumentLocatorSAXFunc	setDocumentLocator
    startDocumentSAXFunc	startDocument
    endDocumentSAXFunc	endDocument
    startElementSAXFunc	startElement
    endElementSAXFunc	endElement
    referenceSAXFunc	reference
    charactersSAXFunc	characters
    ignorableWhitespaceSAXFunc	ignorableWhitespace
    processingInstructionSAXFunc	processingInstruction
    commentSAXFunc	comment
    warningSAXFunc	warning
    errorSAXFunc	error
    fatalErrorSAXFunc	fatalError	: unused error() get all the errors
    getParameterEntitySAXFunc	getParameterEntity
    cdataBlockSAXFunc	cdataBlock
    externalSubsetSAXFunc	externalSubset
    unsigned int	initialized
} xmlSAXHandlerV1;

Typedef xmlSAXHandlerV1Ptr

xmlSAXHandlerV1 * xmlSAXHandlerV1Ptr;

Function type attributeDeclSAXFunc

void	attributeDeclSAXFunc		(void * ctx, 
					 const xmlChar * elem, 
					 const xmlChar * fullname, 
					 int type, 
					 int def, 
					 const xmlChar * defaultValue, 
					 xmlEnumerationPtr tree)

An attribute definition has been parsed.

`ctx`:	the user data (XML parser context)
`elem`:	the name of the element
`fullname`:	the attribute name
`type`:	the attribute type
`def`:	the type of default value
`defaultValue`:	the attribute default value
`tree`:	the tree of enumerated value set

Function type attributeSAXFunc

void	attributeSAXFunc		(void * ctx, 
					 const xmlChar * name, 
					 const xmlChar * value)

Handle an attribute that has been read by the parser. The default handling is to convert the attribute into an DOM subtree and past it in a new xmlAttr element added to the element.

`ctx`:	the user data (XML parser context)
`name`:	The attribute name, including namespace prefix
`value`:	The attribute value

Function type cdataBlockSAXFunc

void	cdataBlockSAXFunc		(void * ctx, 
					 const xmlChar * value, 
					 int len)

Called when a pcdata block has been parsed.

`ctx`:	the user data (XML parser context)
`value`:	The pcdata content
`len`:	the block length

Function type charactersSAXFunc

void	charactersSAXFunc		(void * ctx, 
					 const xmlChar * ch, 
					 int len)

Receiving some chars from the parser.

`ctx`:	the user data (XML parser context)
`ch`:	a xmlChar string
`len`:	the number of xmlChar

Function type commentSAXFunc

void	commentSAXFunc			(void * ctx, 
					 const xmlChar * value)

A comment has been parsed.

`ctx`:	the user data (XML parser context)
`value`:	the comment content

Function type elementDeclSAXFunc

void	elementDeclSAXFunc		(void * ctx, 
					 const xmlChar * name, 
					 int type, 
					 xmlElementContentPtr content)

An element definition has been parsed.

`ctx`:	the user data (XML parser context)
`name`:	the element name
`type`:	the element type
`content`:	the element value tree

Function type endDocumentSAXFunc

void	endDocumentSAXFunc		(void * ctx)

Called when the document end has been detected.

ctx: the user data (XML parser context)

Function type endElementNsSAX2Func

void	endElementNsSAX2Func		(void * ctx, 
					 const xmlChar * localname, 
					 const xmlChar * prefix, 
					 const xmlChar * URI)

SAX2 callback when an element end has been detected by the parser. It provides the namespace informations for the element.

`ctx`:	the user data (XML parser context)
`localname`:	the local name of the element
`prefix`:	the element namespace prefix if available
`URI`:	the element namespace name if available

Function type endElementSAXFunc

void	endElementSAXFunc		(void * ctx, 
					 const xmlChar * name)

Called when the end of an element has been detected.

`ctx`:	the user data (XML parser context)
`name`:	The element name

Function type entityDeclSAXFunc

void	entityDeclSAXFunc		(void * ctx, 
					 const xmlChar * name, 
					 int type, 
					 const xmlChar * publicId, 
					 const xmlChar * systemId, 
					 xmlChar * content)

An entity definition has been parsed.

`ctx`:	the user data (XML parser context)
`name`:	the entity name
`type`:	the entity type
`publicId`:	The public ID of the entity
`systemId`:	The system ID of the entity
`content`:	the entity value (without processing).

Function type errorSAXFunc

void	errorSAXFunc			(void * ctx, 
					 const char * msg, 
					 ... ...)

Display and format an error messages, callback.

`ctx`:	an XML parser context
`msg`:	the message to display/transmit
`...`:	extra parameters for the message display

Function type externalSubsetSAXFunc

void	externalSubsetSAXFunc		(void * ctx, 
					 const xmlChar * name, 
					 const xmlChar * ExternalID, 
					 const xmlChar * SystemID)

Callback on external subset declaration.

`ctx`:	the user data (XML parser context)
`name`:	the root element name
`ExternalID`:	the external ID
`SystemID`:	the SYSTEM ID (e.g. filename or URL)

Function type fatalErrorSAXFunc

void	fatalErrorSAXFunc		(void * ctx, 
					 const char * msg, 
					 ... ...)

Display and format fatal error messages, callback. Note: so far fatalError() SAX callbacks are not used, error() get all the callbacks for errors.

`ctx`:	an XML parser context
`msg`:	the message to display/transmit
`...`:	extra parameters for the message display

Function type getEntitySAXFunc

xmlEntityPtr	getEntitySAXFunc	(void * ctx, 
					 const xmlChar * name)

Get an entity by name.

`ctx`:	the user data (XML parser context)
`name`:	The entity name
`Returns`:	the xmlEntityPtr if found.

Function type getParameterEntitySAXFunc

xmlEntityPtr	getParameterEntitySAXFunc	(void * ctx, 
						 const xmlChar * name)

Get a parameter entity by name.

`ctx`:	the user data (XML parser context)
`name`:	The entity name
`Returns`:	the xmlEntityPtr if found.

Function type hasExternalSubsetSAXFunc

int	hasExternalSubsetSAXFunc	(void * ctx)

Does this document has an external subset?

`ctx`:	the user data (XML parser context)
`Returns`:	1 if true

Function type hasInternalSubsetSAXFunc

int	hasInternalSubsetSAXFunc	(void * ctx)

Does this document has an internal subset.

`ctx`:	the user data (XML parser context)
`Returns`:	1 if true

Function type ignorableWhitespaceSAXFunc

void	ignorableWhitespaceSAXFunc	(void * ctx, 
					 const xmlChar * ch, 
					 int len)

Receiving some ignorable whitespaces from the parser. UNUSED: by default the DOM building will use characters.

`ctx`:	the user data (XML parser context)
`ch`:	a xmlChar string
`len`:	the number of xmlChar

Function type internalSubsetSAXFunc

void	internalSubsetSAXFunc		(void * ctx, 
					 const xmlChar * name, 
					 const xmlChar * ExternalID, 
					 const xmlChar * SystemID)

Callback on internal subset declaration.

`ctx`:	the user data (XML parser context)
`name`:	the root element name
`ExternalID`:	the external ID
`SystemID`:	the SYSTEM ID (e.g. filename or URL)

Function type isStandaloneSAXFunc

int	isStandaloneSAXFunc		(void * ctx)

Is this document tagged standalone?

`ctx`:	the user data (XML parser context)
`Returns`:	1 if true

Function type notationDeclSAXFunc

void	notationDeclSAXFunc		(void * ctx, 
					 const xmlChar * name, 
					 const xmlChar * publicId, 
					 const xmlChar * systemId)

What to do when a notation declaration has been parsed.

`ctx`:	the user data (XML parser context)
`name`:	The name of the notation
`publicId`:	The public ID of the entity
`systemId`:	The system ID of the entity

Function type processingInstructionSAXFunc

void	processingInstructionSAXFunc	(void * ctx, 
					 const xmlChar * target, 
					 const xmlChar * data)

A processing instruction has been parsed.

`ctx`:	the user data (XML parser context)
`target`:	the target name
`data`:	the PI data's

Function type referenceSAXFunc

void	referenceSAXFunc		(void * ctx, 
					 const xmlChar * name)

Called when an entity reference is detected.

`ctx`:	the user data (XML parser context)
`name`:	The entity name

Function type resolveEntitySAXFunc

xmlParserInputPtr	resolveEntitySAXFunc	(void * ctx, 
						 const xmlChar * publicId, 
						 const xmlChar * systemId)

Callback: The entity loader, to control the loading of external entities, the application can either: - override this resolveEntity() callback in the SAX block - or better use the xmlSetExternalEntityLoader() function to set up it's own entity resolution routine

`ctx`:	the user data (XML parser context)
`publicId`:	The public ID of the entity
`systemId`:	The system ID of the entity
`Returns`:	the xmlParserInputPtr if inlined or NULL for DOM behaviour.

Function type setDocumentLocatorSAXFunc

void	setDocumentLocatorSAXFunc	(void * ctx, 
					 xmlSAXLocatorPtr loc)

Receive the document locator at startup, actually xmlDefaultSAXLocator. Everything is available on the context, so this is useless in our case.

`ctx`:	the user data (XML parser context)
`loc`:	A SAX Locator

Function type startDocumentSAXFunc

void	startDocumentSAXFunc		(void * ctx)

Called when the document start being processed.

ctx: the user data (XML parser context)

Function type startElementNsSAX2Func

void	startElementNsSAX2Func		(void * ctx, 
					 const xmlChar * localname, 
					 const xmlChar * prefix, 
					 const xmlChar * URI, 
					 int nb_namespaces, 
					 const xmlChar ** namespaces, 
					 int nb_attributes, 
					 int nb_defaulted, 
					 const xmlChar ** attributes)

SAX2 callback when an element start has been detected by the parser. It provides the namespace informations for the element, as well as the new namespace declarations on the element.

`ctx`:	the user data (XML parser context)
`localname`:	the local name of the element
`prefix`:	the element namespace prefix if available
`URI`:	the element namespace name if available
`nb_namespaces`:	number of namespace definitions on that node
`namespaces`:	pointer to the array of prefix/URI pairs namespace definitions
`nb_attributes`:	the number of attributes on that node
`nb_defaulted`:	the number of defaulted attributes. The defaulted ones are at the end of the array
`attributes`:	pointer to the array of (localname/prefix/URI/value/end) attribute values.

Function type startElementSAXFunc

void	startElementSAXFunc		(void * ctx, 
					 const xmlChar * name, 
					 const xmlChar ** atts)

Called when an opening tag has been processed.

`ctx`:	the user data (XML parser context)
`name`:	The element name, including namespace prefix
`atts`:	An array of name/value attributes pairs, NULL terminated

Function type unparsedEntityDeclSAXFunc

void	unparsedEntityDeclSAXFunc	(void * ctx, 
					 const xmlChar * name, 
					 const xmlChar * publicId, 
					 const xmlChar * systemId, 
					 const xmlChar * notationName)

What to do when an unparsed entity declaration is parsed.

`ctx`:	the user data (XML parser context)
`name`:	The name of the entity
`publicId`:	The public ID of the entity
`systemId`:	The system ID of the entity
`notationName`:	the name of the notation

Function type warningSAXFunc

void	warningSAXFunc			(void * ctx, 
					 const char * msg, 
					 ... ...)

Display and format a warning messages, callback.

`ctx`:	an XML parser context
`msg`:	the message to display/transmit
`...`:	extra parameters for the message display

Function type xmlExternalEntityLoader

xmlParserInputPtr	xmlExternalEntityLoader	(const char * URL, 
						 const char * ID, 
						 xmlParserCtxtPtr context)

External entity loaders types.

`URL`:	The System ID of the resource requested
`ID`:	The Public ID of the resource requested
`context`:	the XML parser context
`Returns`:	the entity input parser.

Function type xmlParserInputDeallocate

void	xmlParserInputDeallocate	(xmlChar * str)

Callback for freeing some parser input allocations.

str: the string to deallocate

xmlByteConsumed ()

long	xmlByteConsumed			(xmlParserCtxtPtr ctxt)

This function provides the current index of the parser relative to the start of the current entity. This function is computed in bytes from the beginning starting at zero and finishing at the size in byte of the file if parsing a file. The function is of constant cost if the input is UTF-8 but can be costly if run on non-UTF-8 input.

`ctxt`:	an XML parser context
`Returns`:	the index in bytes from the beginning of the entity or -1 in case the index could not be computed.

xmlCleanupParser ()

void	xmlCleanupParser		(void)

This function name is somewhat misleading. It does not clean up parser state, it cleans up memory allocated by the library itself. It is a cleanup function for the XML library. It tries to reclaim all related global memory allocated for the library processing. It doesn't deallocate any document related memory. One should call xmlCleanupParser() only when the process has finished using the library and all XML/HTML documents built with it. See also xmlInitParser() which has the opposite function of preparing the library for operations. WARNING: if your application is multithreaded or has plugin support calling this may crash the application if another thread or a plugin is still using libxml2. It's sometimes very hard to guess if libxml2 is in use in the application, some libraries or plugins may use it without notice. In case of doubt abstain from calling this function or do it just before calling exit() to avoid leak reports from valgrind !

xmlClearNodeInfoSeq ()

void	xmlClearNodeInfoSeq		(xmlParserNodeInfoSeqPtr seq)

-- Clear (release memory and reinitialize) node info sequence

seq: a node info sequence pointer

xmlClearParserCtxt ()

void	xmlClearParserCtxt		(xmlParserCtxtPtr ctxt)

Clear (release owned resources) and reinitialize a parser context

ctxt: an XML parser context

xmlCreateDocParserCtxt ()

xmlParserCtxtPtr	xmlCreateDocParserCtxt	(const xmlChar * cur)

Creates a parser context for an XML in-memory document.

`cur`:	a pointer to an array of xmlChar
`Returns`:	the new parser context or NULL

xmlCreateIOParserCtxt ()

xmlParserCtxtPtr	xmlCreateIOParserCtxt	(xmlSAXHandlerPtr sax, 
						 void * user_data, 
						 xmlInputReadCallback ioread, 
						 xmlInputCloseCallback ioclose, 
						 void * ioctx, 
						 xmlCharEncoding enc)

Create a parser context for using the XML parser with an existing I/O stream

`sax`:	a SAX handler
`user_data`:	The user data returned on SAX callbacks
`ioread`:	an I/O read function
`ioclose`:	an I/O close function
`ioctx`:	an I/O handler
`enc`:	the charset encoding if known
`Returns`:	the new parser context or NULL

xmlCreatePushParserCtxt ()

xmlParserCtxtPtr	xmlCreatePushParserCtxt	(xmlSAXHandlerPtr sax, 
						 void * user_data, 
						 const char * chunk, 
						 int size, 
						 const char * filename)

Create a parser context for using the XML parser in push mode. If @buffer and @size are non-NULL, the data is used to detect the encoding. The remaining characters will be parsed so they don't need to be fed in again through xmlParseChunk. To allow content encoding detection, @size should be >= 4 The value of @filename is used for fetching external entities and error/warning reports.

`sax`:	a SAX handler
`user_data`:	The user data returned on SAX callbacks
`chunk`:	a pointer to an array of chars
`size`:	number of chars in the array
`filename`:	an optional file name or URI
`Returns`:	the new parser context or NULL

xmlCtxtReadDoc ()

xmlDocPtr	xmlCtxtReadDoc		(xmlParserCtxtPtr ctxt, 
					 const xmlChar * cur, 
					 const char * URL, 
					 const char * encoding, 
					 int options)

parse an XML in-memory document and build a tree. This reuses the existing @ctxt parser context

`ctxt`:	an XML parser context
`cur`:	a pointer to a zero terminated string
`URL`:	the base URL to use for the document
`encoding`:	the document encoding, or NULL
`options`:	a combination of xmlParserOption
`Returns`:	the resulting document tree

xmlCtxtReadFd ()

xmlDocPtr	xmlCtxtReadFd		(xmlParserCtxtPtr ctxt, 
					 int fd, 
					 const char * URL, 
					 const char * encoding, 
					 int options)

parse an XML from a file descriptor and build a tree. This reuses the existing @ctxt parser context NOTE that the file descriptor will not be closed when the reader is closed or reset.

`ctxt`:	an XML parser context
`fd`:	an open file descriptor
`URL`:	the base URL to use for the document
`encoding`:	the document encoding, or NULL
`options`:	a combination of xmlParserOption
`Returns`:	the resulting document tree

xmlCtxtReadFile ()

xmlDocPtr	xmlCtxtReadFile		(xmlParserCtxtPtr ctxt, 
					 const char * filename, 
					 const char * encoding, 
					 int options)

parse an XML file from the filesystem or the network. This reuses the existing @ctxt parser context

`ctxt`:	an XML parser context
`filename`:	a file or URL
`encoding`:	the document encoding, or NULL
`options`:	a combination of xmlParserOption
`Returns`:	the resulting document tree

xmlCtxtReadIO ()

xmlDocPtr	xmlCtxtReadIO		(xmlParserCtxtPtr ctxt, 
					 xmlInputReadCallback ioread, 
					 xmlInputCloseCallback ioclose, 
					 void * ioctx, 
					 const char * URL, 
					 const char * encoding, 
					 int options)

parse an XML document from I/O functions and source and build a tree. This reuses the existing @ctxt parser context

`ctxt`:	an XML parser context
`ioread`:	an I/O read function
`ioclose`:	an I/O close function
`ioctx`:	an I/O handler
`URL`:	the base URL to use for the document
`encoding`:	the document encoding, or NULL
`options`:	a combination of xmlParserOption
`Returns`:	the resulting document tree

xmlCtxtReadMemory ()

xmlDocPtr	xmlCtxtReadMemory	(xmlParserCtxtPtr ctxt, 
					 const char * buffer, 
					 int size, 
					 const char * URL, 
					 const char * encoding, 
					 int options)

parse an XML in-memory document and build a tree. This reuses the existing @ctxt parser context

`ctxt`:	an XML parser context
`buffer`:	a pointer to a char array
`size`:	the size of the array
`URL`:	the base URL to use for the document
`encoding`:	the document encoding, or NULL
`options`:	a combination of xmlParserOption
`Returns`:	the resulting document tree

xmlCtxtReset ()

void	xmlCtxtReset			(xmlParserCtxtPtr ctxt)

Reset a parser context

ctxt: an XML parser context

xmlCtxtResetPush ()

int	xmlCtxtResetPush		(xmlParserCtxtPtr ctxt, 
					 const char * chunk, 
					 int size, 
					 const char * filename, 
					 const char * encoding)

Reset a push parser context

`ctxt`:	an XML parser context
`chunk`:	a pointer to an array of chars
`size`:	number of chars in the array
`filename`:	an optional file name or URI
`encoding`:	the document encoding, or NULL
`Returns`:	0 in case of success and 1 in case of error

xmlCtxtUseOptions ()

int	xmlCtxtUseOptions		(xmlParserCtxtPtr ctxt, 
					 int options)

Applies the options to the parser context

`ctxt`:	an XML parser context
`options`:	a combination of xmlParserOption
`Returns`:	0 in case of success, the set of unknown or unimplemented options in case of error.

xmlFreeParserCtxt ()

void	xmlFreeParserCtxt		(xmlParserCtxtPtr ctxt)

Free all the memory used by a parser context. However the parsed document in ctxt->myDoc is not freed.

ctxt: an XML parser context

xmlGetExternalEntityLoader ()

xmlExternalEntityLoader	xmlGetExternalEntityLoader	(void)

Get the default external entity resolver function for the application

Returns: the xmlExternalEntityLoader function pointer

xmlGetFeature ()

int	xmlGetFeature			(xmlParserCtxtPtr ctxt, 
					 const char * name, 
					 void * result)

Read the current value of one feature of this parser instance

`ctxt`:	an XML/HTML parser context
`name`:	the feature name
`result`:	location to store the result
`Returns`:	-1 in case or error, 0 otherwise

xmlGetFeaturesList ()

int	xmlGetFeaturesList		(int * len, 
					 const char ** result)

Copy at most *@len feature names into the @result array

`len`:	the length of the features name array (input/output)
`result`:	an array of string to be filled with the features name.
`Returns`:	-1 in case or error, or the total number of features, len is updated with the number of strings copied, strings must not be deallocated

xmlHasFeature ()

int	xmlHasFeature			(xmlFeature feature)

Examines if the library has been compiled with a given feature.

`feature`:	the feature to be examined
`Returns`:	a non-zero value if the feature exist, otherwise zero. Returns zero (0) if the feature does not exist or an unknown unknown feature is requested, non-zero otherwise.

xmlIOParseDTD ()

xmlDtdPtr	xmlIOParseDTD		(xmlSAXHandlerPtr sax, 
					 xmlParserInputBufferPtr input, 
					 xmlCharEncoding enc)

Load and parse a DTD

`sax`:	the SAX handler block or NULL
`input`:	an Input Buffer
`enc`:	the charset encoding if known
`Returns`:	the resulting xmlDtdPtr or NULL in case of error. @input will be freed by the function in any case.

xmlInitNodeInfoSeq ()

void	xmlInitNodeInfoSeq		(xmlParserNodeInfoSeqPtr seq)

-- Initialize (set to initial state) node info sequence

seq: a node info sequence pointer

xmlInitParser ()

void	xmlInitParser			(void)

Initialization function for the XML parser. This is not reentrant. Call once before processing in case of use in multithreaded programs.

xmlInitParserCtxt ()

int	xmlInitParserCtxt		(xmlParserCtxtPtr ctxt)

Initialize a parser context

`ctxt`:	an XML parser context
`Returns`:	0 in case of success and -1 in case of error

xmlKeepBlanksDefault ()

int	xmlKeepBlanksDefault		(int val)

Set and return the previous value for default blanks text nodes support. The 1.x version of the parser used an heuristic to try to detect ignorable white spaces. As a result the SAX callback was generating xmlSAX2IgnorableWhitespace() callbacks instead of characters() one, and when using the DOM output text nodes containing those blanks were not generated. The 2.x and later version will switch to the XML standard way and ignorableWhitespace() are only generated when running the parser in validating mode and when the current element doesn't allow CDATA or mixed content. This function is provided as a way to force the standard behavior on 1.X libs and to switch back to the old mode for compatibility when running 1.X client code on 2.X . Upgrade of 1.X code should be done by using xmlIsBlankNode() commodity function to detect the "empty" nodes generated. This value also affect autogeneration of indentation when saving code if blanks sections are kept, indentation is not generated.

`val`:	int 0 or 1
`Returns`:	the last value for 0 for no substitution, 1 for substitution.

xmlLineNumbersDefault ()

int	xmlLineNumbersDefault		(int val)

Set and return the previous value for enabling line numbers in elements contents. This may break on old application and is turned off by default.

`val`:	int 0 or 1
`Returns`:	the last value for 0 for no substitution, 1 for substitution.

xmlLoadExternalEntity ()

xmlParserInputPtr	xmlLoadExternalEntity	(const char * URL, 
						 const char * ID, 
						 xmlParserCtxtPtr ctxt)

Load an external entity, note that the use of this function for unparsed entities may generate problems

`URL`:	the URL for the entity to load
`ID`:	the Public ID for the entity to load
`ctxt`:	the context in which the entity is called or NULL
`Returns`:	the xmlParserInputPtr or NULL

xmlNewIOInputStream ()

xmlParserInputPtr	xmlNewIOInputStream	(xmlParserCtxtPtr ctxt, 
						 xmlParserInputBufferPtr input, 
						 xmlCharEncoding enc)

Create a new input stream structure encapsulating the @input into a stream suitable for the parser.

`ctxt`:	an XML parser context
`input`:	an I/O Input
`enc`:	the charset encoding if known
`Returns`:	the new input stream or NULL

xmlNewParserCtxt ()

xmlParserCtxtPtr	xmlNewParserCtxt	(void)

Allocate and initialize a new parser context.

Returns: the xmlParserCtxtPtr or NULL

xmlParseBalancedChunkMemory ()

int	xmlParseBalancedChunkMemory	(xmlDocPtr doc, 
					 xmlSAXHandlerPtr sax, 
					 void * user_data, 
					 int depth, 
					 const xmlChar * string, 
					 xmlNodePtr * lst)

`doc`:	the document the chunk pertains to
`sax`:	the SAX handler bloc (possibly NULL)
`user_data`:	The user data returned on SAX callbacks (possibly NULL)
`depth`:	Used for loop detection, use 0
`string`:	the input string in UTF8 or ISO-Latin (zero terminated)
`lst`:	the return value for the set of parsed nodes
`Returns`:	0 if the chunk is well balanced, -1 in case of args problem and the parser error code otherwise

xmlParseBalancedChunkMemoryRecover ()

int	xmlParseBalancedChunkMemoryRecover	(xmlDocPtr doc, 
						 xmlSAXHandlerPtr sax, 
						 void * user_data, 
						 int depth, 
						 const xmlChar * string, 
						 xmlNodePtr * lst, 
						 int recover)

`doc`:	the document the chunk pertains to
`sax`:	the SAX handler bloc (possibly NULL)
`user_data`:	The user data returned on SAX callbacks (possibly NULL)
`depth`:	Used for loop detection, use 0
`string`:	the input string in UTF8 or ISO-Latin (zero terminated)
`lst`:	the return value for the set of parsed nodes
`recover`:	return nodes even if the data is broken (use 0)
`Returns`:	0 if the chunk is well balanced, -1 in case of args problem and the parser error code otherwise In case recover is set to 1, the nodelist will not be empty even if the parsed chunk is not well balanced, assuming the parsing succeeded to some extent.

xmlParseChunk ()

int	xmlParseChunk			(xmlParserCtxtPtr ctxt, 
					 const char * chunk, 
					 int size, 
					 int terminate)

Parse a Chunk of memory

`ctxt`:	an XML parser context
`chunk`:	an char array
`size`:	the size in byte of the chunk
`terminate`:	last chunk indicator
`Returns`:	zero if no error, the xmlParserErrors otherwise.

xmlParseCtxtExternalEntity ()

int	xmlParseCtxtExternalEntity	(xmlParserCtxtPtr ctx, 
					 const xmlChar * URL, 
					 const xmlChar * ID, 
					 xmlNodePtr * lst)

Parse an external general entity within an existing parsing context An external general parsed entity is well-formed if it matches the production labeled extParsedEnt. [78] extParsedEnt ::= TextDecl? content

`ctx`:	the existing parsing context
`URL`:	the URL for the entity to load
`ID`:	the System ID for the entity to load
`lst`:	the return value for the set of parsed nodes
`Returns`:	0 if the entity is well formed, -1 in case of args problem and the parser error code otherwise

xmlParseDTD ()

xmlDtdPtr	xmlParseDTD		(const xmlChar * ExternalID, 
					 const xmlChar * SystemID)

Load and parse an external subset.

`ExternalID`:	a NAME* containing the External ID of the DTD
`SystemID`:	a NAME* containing the URL to the DTD
`Returns`:	the resulting xmlDtdPtr or NULL in case of error.

xmlParseDoc ()

xmlDocPtr	xmlParseDoc		(const xmlChar * cur)

parse an XML in-memory document and build a tree.

`cur`:	a pointer to an array of xmlChar
`Returns`:	the resulting document tree

xmlParseDocument ()

int	xmlParseDocument		(xmlParserCtxtPtr ctxt)

parse an XML document (and build a tree if using the standard SAX interface). [1] document ::= prolog element Misc* [22] prolog ::= XMLDecl? Misc* (doctypedecl Misc*)?

`ctxt`:	an XML parser context
`Returns`:	0, -1 in case of error. the parser context is augmented as a result of the parsing.

xmlParseEntity ()

xmlDocPtr	xmlParseEntity		(const char * filename)

parse an XML external entity out of context and build a tree. [78] extParsedEnt ::= TextDecl? content This correspond to a "Well Balanced" chunk

`filename`:	the filename
`Returns`:	the resulting document tree

xmlParseExtParsedEnt ()

int	xmlParseExtParsedEnt		(xmlParserCtxtPtr ctxt)

parse a general parsed entity An external general parsed entity is well-formed if it matches the production labeled extParsedEnt. [78] extParsedEnt ::= TextDecl? content

`ctxt`:	an XML parser context
`Returns`:	0, -1 in case of error. the parser context is augmented as a result of the parsing.

xmlParseExternalEntity ()

int	xmlParseExternalEntity		(xmlDocPtr doc, 
					 xmlSAXHandlerPtr sax, 
					 void * user_data, 
					 int depth, 
					 const xmlChar * URL, 
					 const xmlChar * ID, 
					 xmlNodePtr * lst)

Parse an external general entity An external general parsed entity is well-formed if it matches the production labeled extParsedEnt. [78] extParsedEnt ::= TextDecl? content

`doc`:	the document the chunk pertains to
`sax`:	the SAX handler bloc (possibly NULL)
`user_data`:	The user data returned on SAX callbacks (possibly NULL)
`depth`:	Used for loop detection, use 0
`URL`:	the URL for the entity to load
`ID`:	the System ID for the entity to load
`lst`:	the return value for the set of parsed nodes
`Returns`:	0 if the entity is well formed, -1 in case of args problem and the parser error code otherwise

xmlParseFile ()

xmlDocPtr	xmlParseFile		(const char * filename)

parse an XML file and build a tree. Automatic support for ZLIB/Compress compressed document is provided by default if found at compile-time.

`filename`:	the filename
`Returns`:	the resulting document tree if the file was wellformed, NULL otherwise.

xmlParseInNodeContext ()

xmlParserErrors	xmlParseInNodeContext	(xmlNodePtr node, 
					 const char * data, 
					 int datalen, 
					 int options, 
					 xmlNodePtr * lst)

Parse a well-balanced chunk of an XML document within the context (DTD, namespaces, etc ...) of the given node. The allowed sequence for the data is a Well Balanced Chunk defined by the content production in the XML grammar: [43] content ::= (element | CharData | Reference | CDSect | PI | Comment)*

`node`:	the context node
`data`:	the input string
`datalen`:	the input string length in bytes
`options`:	a combination of xmlParserOption
`lst`:	the return value for the set of parsed nodes
`Returns`:	XML_ERR_OK if the chunk is well balanced, and the parser error code otherwise

xmlParseMemory ()

xmlDocPtr	xmlParseMemory		(const char * buffer, 
					 int size)

parse an XML in-memory block and build a tree.

`buffer`:	an pointer to a char array
`size`:	the size of the array
`Returns`:	the resulting document tree

xmlParserAddNodeInfo ()

void	xmlParserAddNodeInfo		(xmlParserCtxtPtr ctxt, 
					 const xmlParserNodeInfoPtr info)

Insert node info record into the sorted sequence

`ctxt`:	an XML parser context
`info`:	a node info sequence pointer

xmlParserFindNodeInfo ()

const xmlParserNodeInfo *	xmlParserFindNodeInfo	(const xmlParserCtxtPtr ctx, 
							 const xmlNodePtr node)

Find the parser node info struct for a given node

`ctx`:	an XML parser context
`node`:	an XML node within the tree
`Returns`:	an xmlParserNodeInfo block pointer or NULL

xmlParserFindNodeInfoIndex ()

unsigned long	xmlParserFindNodeInfoIndex	(const xmlParserNodeInfoSeqPtr seq, 
						 const xmlNodePtr node)

xmlParserFindNodeInfoIndex : Find the index that the info record for the given node is or should be at in a sorted sequence

`seq`:	a node info sequence pointer
`node`:	an XML node pointer
`Returns`:	a long indicating the position of the record

xmlParserInputGrow ()

int	xmlParserInputGrow		(xmlParserInputPtr in, 
					 int len)

This function increase the input for the parser. It tries to preserve pointers to the input buffer, and keep already read data

`in`:	an XML parser input
`len`:	an indicative size for the lookahead
`Returns`:	the number of xmlChars read, or -1 in case of error, 0 indicate the end of this entity

xmlParserInputRead ()

int	xmlParserInputRead		(xmlParserInputPtr in, 
					 int len)

This function refresh the input for the parser. It doesn't try to preserve pointers to the input buffer, and discard already read data

`in`:	an XML parser input
`len`:	an indicative size for the lookahead
`Returns`:	the number of xmlChars read, or -1 in case of error, 0 indicate the end of this entity

xmlPedanticParserDefault ()

int	xmlPedanticParserDefault	(int val)

Set and return the previous value for enabling pedantic warnings.

`val`:	int 0 or 1
`Returns`:	the last value for 0 for no substitution, 1 for substitution.

xmlReadDoc ()

xmlDocPtr	xmlReadDoc		(const xmlChar * cur, 
					 const char * URL, 
					 const char * encoding, 
					 int options)

parse an XML in-memory document and build a tree.

`cur`:	a pointer to a zero terminated string
`URL`:	the base URL to use for the document
`encoding`:	the document encoding, or NULL
`options`:	a combination of xmlParserOption
`Returns`:	the resulting document tree

xmlReadFd ()

xmlDocPtr	xmlReadFd		(int fd, 
					 const char * URL, 
					 const char * encoding, 
					 int options)

parse an XML from a file descriptor and build a tree. NOTE that the file descriptor will not be closed when the reader is closed or reset.

`fd`:	an open file descriptor
`URL`:	the base URL to use for the document
`encoding`:	the document encoding, or NULL
`options`:	a combination of xmlParserOption
`Returns`:	the resulting document tree

xmlReadFile ()

xmlDocPtr	xmlReadFile		(const char * filename, 
					 const char * encoding, 
					 int options)

parse an XML file from the filesystem or the network.

`filename`:	a file or URL
`encoding`:	the document encoding, or NULL
`options`:	a combination of xmlParserOption
`Returns`:	the resulting document tree

xmlReadIO ()

xmlDocPtr	xmlReadIO		(xmlInputReadCallback ioread, 
					 xmlInputCloseCallback ioclose, 
					 void * ioctx, 
					 const char * URL, 
					 const char * encoding, 
					 int options)

parse an XML document from I/O functions and source and build a tree.

`ioread`:	an I/O read function
`ioclose`:	an I/O close function
`ioctx`:	an I/O handler
`URL`:	the base URL to use for the document
`encoding`:	the document encoding, or NULL
`options`:	a combination of xmlParserOption
`Returns`:	the resulting document tree

xmlReadMemory ()

xmlDocPtr	xmlReadMemory		(const char * buffer, 
					 int size, 
					 const char * URL, 
					 const char * encoding, 
					 int options)

parse an XML in-memory document and build a tree.

`buffer`:	a pointer to a char array
`size`:	the size of the array
`URL`:	the base URL to use for the document
`encoding`:	the document encoding, or NULL
`options`:	a combination of xmlParserOption
`Returns`:	the resulting document tree

xmlRecoverDoc ()

xmlDocPtr	xmlRecoverDoc		(const xmlChar * cur)

parse an XML in-memory document and build a tree. In the case the document is not Well Formed, a attempt to build a tree is tried anyway

`cur`:	a pointer to an array of xmlChar
`Returns`:	the resulting document tree or NULL in case of failure

xmlRecoverFile ()

xmlDocPtr	xmlRecoverFile		(const char * filename)

parse an XML file and build a tree. Automatic support for ZLIB/Compress compressed document is provided by default if found at compile-time. In the case the document is not Well Formed, it attempts to build a tree anyway

`filename`:	the filename
`Returns`:	the resulting document tree or NULL in case of failure

xmlRecoverMemory ()

xmlDocPtr	xmlRecoverMemory	(const char * buffer, 
					 int size)

parse an XML in-memory block and build a tree. In the case the document is not Well Formed, an attempt to build a tree is tried anyway

`buffer`:	an pointer to a char array
`size`:	the size of the array
`Returns`:	the resulting document tree or NULL in case of error

xmlSAXParseDTD ()

xmlDtdPtr	xmlSAXParseDTD		(xmlSAXHandlerPtr sax, 
					 const xmlChar * ExternalID, 
					 const xmlChar * SystemID)

Load and parse an external subset.

`sax`:	the SAX handler block
`ExternalID`:	a NAME* containing the External ID of the DTD
`SystemID`:	a NAME* containing the URL to the DTD
`Returns`:	the resulting xmlDtdPtr or NULL in case of error.

xmlSAXParseDoc ()

xmlDocPtr	xmlSAXParseDoc		(xmlSAXHandlerPtr sax, 
					 const xmlChar * cur, 
					 int recovery)

parse an XML in-memory document and build a tree. It use the given SAX function block to handle the parsing callback. If sax is NULL, fallback to the default DOM tree building routines.

`sax`:	the SAX handler block
`cur`:	a pointer to an array of xmlChar
`recovery`:	work in recovery mode, i.e. tries to read no Well Formed documents
`Returns`:	the resulting document tree

xmlSAXParseEntity ()

xmlDocPtr	xmlSAXParseEntity	(xmlSAXHandlerPtr sax, 
					 const char * filename)

parse an XML external entity out of context and build a tree. It use the given SAX function block to handle the parsing callback. If sax is NULL, fallback to the default DOM tree building routines. [78] extParsedEnt ::= TextDecl? content This correspond to a "Well Balanced" chunk

`sax`:	the SAX handler block
`filename`:	the filename
`Returns`:	the resulting document tree

xmlSAXParseFile ()

xmlDocPtr	xmlSAXParseFile		(xmlSAXHandlerPtr sax, 
					 const char * filename, 
					 int recovery)

`sax`:	the SAX handler block
`filename`:	the filename
`recovery`:	work in recovery mode, i.e. tries to read no Well Formed documents
`Returns`:	the resulting document tree

xmlSAXParseFileWithData ()

xmlDocPtr	xmlSAXParseFileWithData	(xmlSAXHandlerPtr sax, 
					 const char * filename, 
					 int recovery, 
					 void * data)

parse an XML file and build a tree. Automatic support for ZLIB/Compress compressed document is provided by default if found at compile-time. It use the given SAX function block to handle the parsing callback. If sax is NULL, fallback to the default DOM tree building routines. User data (void *) is stored within the parser context in the context's _private member, so it is available nearly everywhere in libxml

`sax`:	the SAX handler block
`filename`:	the filename
`recovery`:	work in recovery mode, i.e. tries to read no Well Formed documents
`data`:	the userdata
`Returns`:	the resulting document tree

xmlSAXParseMemory ()

xmlDocPtr	xmlSAXParseMemory	(xmlSAXHandlerPtr sax, 
					 const char * buffer, 
					 int size, 
					 int recovery)

parse an XML in-memory block and use the given SAX function block to handle the parsing callback. If sax is NULL, fallback to the default DOM tree building routines.

`sax`:	the SAX handler block
`buffer`:	an pointer to a char array
`size`:	the size of the array
`recovery`:	work in recovery mode, i.e. tries to read not Well Formed documents
`Returns`:	the resulting document tree

xmlSAXParseMemoryWithData ()

xmlDocPtr	xmlSAXParseMemoryWithData	(xmlSAXHandlerPtr sax, 
						 const char * buffer, 
						 int size, 
						 int recovery, 
						 void * data)

parse an XML in-memory block and use the given SAX function block to handle the parsing callback. If sax is NULL, fallback to the default DOM tree building routines. User data (void *) is stored within the parser context in the context's _private member, so it is available nearly everywhere in libxml

`sax`:	the SAX handler block
`buffer`:	an pointer to a char array
`size`:	the size of the array
`recovery`:	work in recovery mode, i.e. tries to read no Well Formed documents
`data`:	the userdata
`Returns`:	the resulting document tree

xmlSAXUserParseFile ()

int	xmlSAXUserParseFile		(xmlSAXHandlerPtr sax, 
					 void * user_data, 
					 const char * filename)

parse an XML file and call the given SAX handler routines. Automatic support for ZLIB/Compress compressed document is provided

`sax`:	a SAX handler
`user_data`:	The user data returned on SAX callbacks
`filename`:	a file name
`Returns`:	0 in case of success or a error number otherwise

xmlSAXUserParseMemory ()

int	xmlSAXUserParseMemory		(xmlSAXHandlerPtr sax, 
					 void * user_data, 
					 const char * buffer, 
					 int size)

A better SAX parsing routine. parse an XML in-memory buffer and call the given SAX handler routines.

`sax`:	a SAX handler
`user_data`:	The user data returned on SAX callbacks
`buffer`:	an in-memory XML document input
`size`:	the length of the XML document in bytes
`Returns`:	0 in case of success or a error number otherwise

xmlSetExternalEntityLoader ()

void	xmlSetExternalEntityLoader	(xmlExternalEntityLoader f)

Changes the defaultexternal entity resolver function for the application

f: the new entity resolver function

xmlSetFeature ()

int	xmlSetFeature			(xmlParserCtxtPtr ctxt, 
					 const char * name, 
					 void * value)

Change the current value of one feature of this parser instance

`ctxt`:	an XML/HTML parser context
`name`:	the feature name
`value`:	pointer to the location of the new value
`Returns`:	-1 in case or error, 0 otherwise

xmlSetupParserForBuffer ()

void	xmlSetupParserForBuffer		(xmlParserCtxtPtr ctxt, 
					 const xmlChar * buffer, 
					 const char * filename)

Setup the parser context to parse a new buffer; Clears any prior contents from the parser context. The buffer parameter must not be NULL, but the filename parameter can be

`ctxt`:	an XML parser context
`buffer`:	a xmlChar * buffer
`filename`:	a file name

xmlStopParser ()

void	xmlStopParser			(xmlParserCtxtPtr ctxt)

Blocks further parser processing

ctxt: an XML parser context

xmlSubstituteEntitiesDefault ()

int	xmlSubstituteEntitiesDefault	(int val)

Set and return the previous value for default entity support. Initially the parser always keep entity references instead of substituting entity values in the output. This function has to be used to change the default parser behavior SAX::substituteEntities() has to be used for changing that on a file by file basis.

`val`:	int 0 or 1
`Returns`:	the last value for 0 for no substitution, 1 for substitution.

parser

Synopsis

Description

Details

Macro XML_COMPLETE_ATTRS

Macro XML_DEFAULT_VERSION

Macro XML_DETECT_IDS

Macro XML_SAX2_MAGIC

Macro XML_SKIP_IDS

Enum xmlFeature

Enum xmlParserInputState

Enum xmlParserMode

Structure xmlParserNodeInfo

Typedef xmlParserNodeInfoPtr

Structure xmlParserNodeInfoSeq

Typedef xmlParserNodeInfoSeqPtr

Enum xmlParserOption

Structure xmlSAXHandlerV1

Typedef xmlSAXHandlerV1Ptr