Module xpointer from libxml2

# ## Module xpointer from libxml2

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API to handle XML Pointers Base implementation was made accordingly to W3C Candidate Recommendation 7 June 2000 ## Table of Contents
    Structure xmlLocationSet
    struct _xmlLocationSet
    Typedef xmlLocationSet * xmlLocationSetPtr
    xmlNodePtr	xmlXPtrBuildNodeList	(xmlXPathObjectPtr obj)
    xmlXPathObjectPtr	xmlXPtrEval	(const xmlChar * str,
    					 xmlXPathContextPtr ctx)
    void	xmlXPtrEvalRangePredicate	(xmlXPathParserContextPtr ctxt)
    void	xmlXPtrFreeLocationSet		(xmlLocationSetPtr obj)
    void	xmlXPtrLocationSetAdd		(xmlLocationSetPtr cur,
    					 xmlXPathObjectPtr val)
    xmlLocationSetPtr	xmlXPtrLocationSetCreate	(xmlXPathObjectPtr val)
    void	xmlXPtrLocationSetDel		(xmlLocationSetPtr cur,
    					 xmlXPathObjectPtr val)
    xmlLocationSetPtr	xmlXPtrLocationSetMerge	(xmlLocationSetPtr val1,
    						 xmlLocationSetPtr val2)
    void	xmlXPtrLocationSetRemove	(xmlLocationSetPtr cur,
    					 int val)
    xmlXPathObjectPtr	xmlXPtrNewCollapsedRange	(xmlNodePtr start)
    xmlXPathContextPtr	xmlXPtrNewContext	(xmlDocPtr doc,
    						 xmlNodePtr here,
    						 xmlNodePtr origin)
    xmlXPathObjectPtr	xmlXPtrNewLocationSetNodeSet	(xmlNodeSetPtr set)
    xmlXPathObjectPtr	xmlXPtrNewLocationSetNodes	(xmlNodePtr start,
    							 xmlNodePtr end)
    xmlXPathObjectPtr	xmlXPtrNewRange	(xmlNodePtr start,
    					 int startindex,
    					 xmlNodePtr end,
    					 int endindex)
    xmlXPathObjectPtr	xmlXPtrNewRangeNodeObject	(xmlNodePtr start,
    							 xmlXPathObjectPtr end)
    xmlXPathObjectPtr	xmlXPtrNewRangeNodePoint	(xmlNodePtr start,
    							 xmlXPathObjectPtr end)
    xmlXPathObjectPtr	xmlXPtrNewRangeNodes	(xmlNodePtr start,
    						 xmlNodePtr end)
    xmlXPathObjectPtr	xmlXPtrNewRangePointNode	(xmlXPathObjectPtr start,
    							 xmlNodePtr end)
    xmlXPathObjectPtr	xmlXPtrNewRangePoints	(xmlXPathObjectPtr start,
    						 xmlXPathObjectPtr end)
    void	xmlXPtrRangeToFunction		(xmlXPathParserContextPtr ctxt,
    					 int nargs)
    xmlXPathObjectPtr	xmlXPtrWrapLocationSet	(xmlLocationSetPtr val)
## Description ### Structure xmlLocationSet
    Structure xmlLocationSet
    struct _xmlLocationSet {
        int	locNr	: number of locations in the set
        int	locMax	: size of the array as allocated
        xmlXPathObjectPtr *	locTab	: array of locations
    }
### Function: xmlXPtrBuildNodeList
    xmlNodePtr	xmlXPtrBuildNodeList	(xmlXPathObjectPtr obj)
Build a node list tree copy of the XPointer result. This will drop Attributes and Namespace declarations.
`obj`: | the XPointer result from the evaluation.
`Returns`: | an xmlNodePtr list or NULL. the caller has to free the node tree.
### Function: xmlXPtrEval
    xmlXPathObjectPtr	xmlXPtrEval	(const xmlChar * str,
    					 xmlXPathContextPtr ctx)
Evaluate the XPath Location Path in the given context.
`str`: | the XPointer expression
`ctx`: | the XPointer context
`Returns`: | the xmlXPathObjectPtr resulting from the evaluation or NULL. the caller has to free the object.
### Function: xmlXPtrEvalRangePredicate
    void	xmlXPtrEvalRangePredicate	(xmlXPathParserContextPtr ctxt)
[8] Predicate ::= '[' PredicateExpr ']' [9] PredicateExpr ::= Expr Evaluate a predicate as in xmlXPathEvalPredicate() but for a Location Set instead of a node set
`ctxt`: | the XPointer Parser context
### Function: xmlXPtrFreeLocationSet
    void	xmlXPtrFreeLocationSet		(xmlLocationSetPtr obj)
Free the LocationSet compound (not the actual ranges !).
`obj`: | the xmlLocationSetPtr to free
### Function: xmlXPtrLocationSetAdd
    void	xmlXPtrLocationSetAdd		(xmlLocationSetPtr cur,
    					 xmlXPathObjectPtr val)
add a new xmlXPathObjectPtr to an existing LocationSet If the location already exist in the set @val is freed.
`cur`: | the initial range set
`val`: | a new xmlXPathObjectPtr
### Function: xmlXPtrLocationSetCreate
    xmlLocationSetPtr	xmlXPtrLocationSetCreate	(xmlXPathObjectPtr val)
Create a new xmlLocationSetPtr of type double and of value @val
`val`: | an initial xmlXPathObjectPtr, or NULL
`Returns`: | the newly created object.
### Function: xmlXPtrLocationSetDel
    void	xmlXPtrLocationSetDel		(xmlLocationSetPtr cur,
    					 xmlXPathObjectPtr val)
Removes an xmlXPathObjectPtr from an existing LocationSet
`cur`: | the initial range set
`val`: | an xmlXPathObjectPtr
### Function: xmlXPtrLocationSetMerge
    xmlLocationSetPtr	xmlXPtrLocationSetMerge	(xmlLocationSetPtr val1,
    						 xmlLocationSetPtr val2)
Merges two rangesets, all ranges from @val2 are added to @val1
`val1`: | the first LocationSet
`val2`: | the second LocationSet
`Returns`: | val1 once extended or NULL in case of error.
### Function: xmlXPtrLocationSetRemove
    void	xmlXPtrLocationSetRemove	(xmlLocationSetPtr cur,
    					 int val)
Removes an entry from an existing LocationSet list.
`cur`: | the initial range set
`val`: | the index to remove
### Function: xmlXPtrNewCollapsedRange
    xmlXPathObjectPtr	xmlXPtrNewCollapsedRange	(xmlNodePtr start)
Create a new xmlXPathObjectPtr of type range using a single nodes
`start`: | the starting and ending node
`Returns`: | the newly created object.
### Function: xmlXPtrNewContext
    xmlXPathContextPtr	xmlXPtrNewContext	(xmlDocPtr doc,
    						 xmlNodePtr here,
    						 xmlNodePtr origin)
Create a new XPointer context
`doc`: | the XML document
`here`: | the node that directly contains the XPointer being evaluated or NULL
`origin`: | the element from which a user or program initiated traversal of the link, or NULL.
`Returns`: | the xmlXPathContext just allocated.
### Function: xmlXPtrNewLocationSetNodeSet
    xmlXPathObjectPtr	xmlXPtrNewLocationSetNodeSet	(xmlNodeSetPtr set)
Create a new xmlXPathObjectPtr of type LocationSet and initialize it with all the nodes from @set
`set`: | a node set
`Returns`: | the newly created object.
### Function: xmlXPtrNewLocationSetNodes
    xmlXPathObjectPtr	xmlXPtrNewLocationSetNodes	(xmlNodePtr start,
    							 xmlNodePtr end)
Create a new xmlXPathObjectPtr of type LocationSet and initialize it with the single range made of the two nodes @start and @end
`start`: | the start NodePtr value
`end`: | the end NodePtr value or NULL
`Returns`: | the newly created object.
### Function: xmlXPtrNewRange
    xmlXPathObjectPtr	xmlXPtrNewRange	(xmlNodePtr start,
    					 int startindex,
    					 xmlNodePtr end,
    					 int endindex)
Create a new xmlXPathObjectPtr of type range
`start`: | the starting node
`startindex`: | the start index
`end`: | the ending point
`endindex`: | the ending index
`Returns`: | the newly created object.
### Function: xmlXPtrNewRangeNodeObject
    xmlXPathObjectPtr	xmlXPtrNewRangeNodeObject	(xmlNodePtr start,
    							 xmlXPathObjectPtr end)
Create a new xmlXPathObjectPtr of type range from a not to an object
`start`: | the starting node
`end`: | the ending object
`Returns`: | the newly created object.
### Function: xmlXPtrNewRangeNodePoint
    xmlXPathObjectPtr	xmlXPtrNewRangeNodePoint	(xmlNodePtr start,
    							 xmlXPathObjectPtr end)
Create a new xmlXPathObjectPtr of type range from a node to a point
`start`: | the starting node
`end`: | the ending point
`Returns`: | the newly created object.
### Function: xmlXPtrNewRangeNodes
    xmlXPathObjectPtr	xmlXPtrNewRangeNodes	(xmlNodePtr start,
    						 xmlNodePtr end)
Create a new xmlXPathObjectPtr of type range using 2 nodes
`start`: | the starting node
`end`: | the ending node
`Returns`: | the newly created object.
### Function: xmlXPtrNewRangePointNode
    xmlXPathObjectPtr	xmlXPtrNewRangePointNode	(xmlXPathObjectPtr start,
    							 xmlNodePtr end)
Create a new xmlXPathObjectPtr of type range from a point to a node
`start`: | the starting point
`end`: | the ending node
`Returns`: | the newly created object.
### Function: xmlXPtrNewRangePoints
    xmlXPathObjectPtr	xmlXPtrNewRangePoints	(xmlXPathObjectPtr start,
    						 xmlXPathObjectPtr end)
Create a new xmlXPathObjectPtr of type range using 2 Points
`start`: | the starting point
`end`: | the ending point
`Returns`: | the newly created object.
### Function: xmlXPtrRangeToFunction
    void	xmlXPtrRangeToFunction		(xmlXPathParserContextPtr ctxt,
    					 int nargs)
Implement the range-to() XPointer function
`ctxt`: | the XPointer Parser context
`nargs`: | the number of args
### Function: xmlXPtrWrapLocationSet
    xmlXPathObjectPtr	xmlXPtrWrapLocationSet	(xmlLocationSetPtr val)
Wrap the LocationSet @val in a new xmlXPathObjectPtr
`val`: | the LocationSet value
`Returns`: | the newly created object.
Daniel Veillard