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Struct libxml2.XPathContext

Import line:	libxml2 = imports.gi.libxml2;
GIR File:	libxml2-2.0.gir
C documentation:	libxml2XPathContext
Struct :	XPathContext
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Expression evaluation occurs with respect to a context. he context consists of: - a node (the context node) - a node list (the context node list) - a set of variable bindings - a function library - the set of namespace declarations in scope for the expression Following the switch to hash tables, this need to be trimmed up at the next binary incompatible release. The node may be modified when the context is passed to libxml2 for an XPath evaluation so you may need to initialize it again before the next call.

Properties
None

Methods / Constructors
Method / Constructor		Defined By
	new libxml2.XPathContext.XPathNewContext (Doc *doc) : libxml2.XPathContext Create a new libxml2.XPathContext Create a new libxml2.XPathContext Parameters: libxml2.Doc doc* Required (not null) Returns: libxml2.XPathContext
	new libxml2.XPathContext.XPtrNewContext (Doc *doc, Node here, Node origin) : libxml2.XPathContext Create a new libxml2.XPathContext Create a new libxml2.XPathContext Parameters: libxml2.Doc doc* Required (not null) libxml2.Node here Required (not null) libxml2.Node origin Required (not null) the link, or NULL. Returns: libxml2.XPathContext
	SetCache (Number *active, Number value, Number options) : Number Creates/frees an object cache on the XPath context. Creates/frees an object cache on the XPath context. If activates XPath objects (xmlXPathObject) will be cached internally to be reused. Returns 0 if the setting succeeded, and -1 on API or internal errors. Parameters: Number active* Required (not null) the cache Number value Required (not null) This will set the maximum number of XPath objects to be cached per slot Number options Required (not null) Returns: Number	libxml2.XPathContext
	XPathCtxtCompile (Number *str) : libxml2.XPathCompExpr Compile an XPath expression Returns the xmlXPathCompExprPtr resulting from the compilation or NULL. Compile an XPath expression Returns the xmlXPathCompExprPtr resulting from the compilation or NULL. the caller has to free the object. Parameters: Number str* Required (not null) Returns: libxml2.XPathCompExpr	libxml2.XPathContext
	XPathEvalPredicate (XPathObject *res) : Number Evaluate a predicate result for the current node. Evaluate a predicate result for the current node. A PredicateExpr is evaluated by evaluating the Expr and converting the result to a boolean. If the result is a number, the result will be converted to true if the number is equal to the position of the context node in the context node list (as returned by the position function) and will be converted to false otherwise; if the result is not a number, then the result will be converted as if by a call to the boolean function. Returns 1 if predicate is true, 0 otherwise Parameters: libxml2.XPathObject res* Required (not null) Returns: Number	libxml2.XPathContext
	XPathFreeContext () : none Free up an xmlXPathContext Free up an xmlXPathContext Returns: none	libxml2.XPathContext
	XPathFunctionLookup (Number *name) : [object Object] Search in the Function array of the context for the given function. Search in the Function array of the context for the given function. Returns the xmlXPathFunction or NULL if not found Parameters: Number name* Required (not null) Returns: [object Object]	libxml2.XPathContext
	XPathFunctionLookupNS (Number *name, Number ns_uri) : [object Object] Search in the Function array of the context for the given function. Search in the Function array of the context for the given function. Returns the xmlXPathFunction or NULL if not found Parameters: Number name* Required (not null) Number ns_uri Required (not null) Returns: [object Object]	libxml2.XPathContext
	XPathNsLookup (Number *prefix) : Number Search in the namespace declaration array of the context for the given namespace name associated to the given prefix Returns the value or NULL if not found Search in the namespace declaration array of the context for the given namespace name associated to the given prefix Returns the value or NULL if not found Parameters: Number prefix* Required (not null) Returns: Number	libxml2.XPathContext
	XPathRegisterAllFunctions () : none Registers all default XPath functions in this context Registers all default XPath functions in this context Returns: none	libxml2.XPathContext
	XPathRegisterFunc (Number *name, Function f) : Number Register a new function. Register a new function. If f is NULL it unregisters the function Returns 0 in case of success, -1 in case of error Parameters: Number name* Required (not null) Function (XPathParserContext *ctxt, Number nargs*) : Number Required (not null) Returns: Number	libxml2.XPathContext
	XPathRegisterFuncLookup (Function f, void* *funcCtxt) : none Registers an external mechanism to do function lookup. Registers an external mechanism to do function lookup. Parameters: Function (void *ctxt, Number name, Number ns_uri) : none Required (not null) void funcCtxt Required (not null) Returns: none	libxml2.XPathContext
	XPathRegisterFuncNS (Number *name, Number ns_uri, Function f) : Number Register a new function. Register a new function. If f is NULL it unregisters the function Returns 0 in case of success, -1 in case of error Parameters: Number name* Required (not null) Number ns_uri Required (not null) Function (XPathParserContext *ctxt, Number nargs*) : Number Required (not null) Returns: Number	libxml2.XPathContext
	XPathRegisterNs (Number *prefix, Number ns_uri) : Number Register a new namespace. Register a new namespace. If ns_uri* is NULL it unregisters the namespace Returns 0 in case of success, -1 in case of error Parameters: Number prefix Required (not null) Number ns_uri Required (not null) Returns: Number	libxml2.XPathContext
	XPathRegisterVariable (Number *name, XPathObject value) : Number Register a new variable value. Register a new variable value. If value* is NULL it unregisters the variable Returns 0 in case of success, -1 in case of error Parameters: Number name Required (not null) libxml2.XPathObject value Required (not null) Returns: Number	libxml2.XPathContext
	XPathRegisterVariableLookup (Function f, void* *data) : none register an external mechanism to do variable lookup register an external mechanism to do variable lookup Parameters: Function (void *ctxt, Number name, Number ns_uri) : none Required (not null) void data Required (not null) Returns: none	libxml2.XPathContext
	XPathRegisterVariableNS (Number *name, Number ns_uri, XPathObject value) : Number Register a new variable value. Register a new variable value. If value* is NULL it unregisters the variable Returns 0 in case of success, -1 in case of error Parameters: Number name Required (not null) Number ns_uri Required (not null) libxml2.XPathObject value Required (not null) Returns: Number	libxml2.XPathContext
	XPathRegisteredFuncsCleanup () : none Cleanup the XPath context data associated to registered functions Cleanup the XPath context data associated to registered functions Returns: none	libxml2.XPathContext
	XPathRegisteredNsCleanup () : none Cleanup the XPath context data associated to registered variables Cleanup the XPath context data associated to registered variables Returns: none	libxml2.XPathContext
	XPathRegisteredVariablesCleanup () : none Cleanup the XPath context data associated to registered variables Cleanup the XPath context data associated to registered variables Returns: none	libxml2.XPathContext
	XPathVariableLookup (Number *name) : libxml2.XPathObject Search in the Variable array of the context for the given variable value. Search in the Variable array of the context for the given variable value. Returns a copy of the value or NULL if not found Parameters: Number name* Required (not null) Returns: libxml2.XPathObject	libxml2.XPathContext
	XPathVariableLookupNS (Number *name, Number ns_uri) : libxml2.XPathObject Search in the Variable array of the context for the given variable value. Search in the Variable array of the context for the given variable value. Returns the a copy of the value or NULL if not found Parameters: Number name* Required (not null) Number ns_uri Required (not null) Returns: libxml2.XPathObject	libxml2.XPathContext

Events
None

Used by These Methods / Signals / Properties
Class / Namespace	Method / Signal / Properties
libxml2 Method	libxml2.XPathEval (Number *str, XPathContext ctx*) : libxml2.XPathObject Evaluate the XPath Location Path in the given context.
libxml2 Method	libxml2.XPathEvalExpression (Number *str, XPathContext ctxt*) : libxml2.XPathObject Evaluate the XPath expression in the given context.
libxml2 Method	libxml2.XPtrEval (Number *str, XPathContext ctx*) : libxml2.XPathObject Evaluate the XPath Location Path in the given context.
libxml2.XPathCompExpr Method	XPathCompiledEval (XPathContext *ctx*) : libxml2.XPathObject Evaluate the Precompiled XPath expression in the given context.
libxml2.XPathCompExpr Method	XPathCompiledEvalToBoolean (XPathContext *ctxt*) : Number Applies the XPath boolean() function on the result of the given compiled expression.
libxml2.XPathParserContext Method	new libxml2.XPathParserContext.XPathNewParserContext (Number *str, XPathContext ctxt*) : libxml2.XPathParserContext Create a new libxml2.XPathParserContext