Type Definition libxml::bindings::xmlXPathVariableLookupFunc

type xmlXPathVariableLookupFunc = Option<unsafe extern "C" fn(ctxt: *mut c_void, name: *const xmlChar, ns_uri: *const xmlChar) -> xmlXPathObjectPtr>;

xmlXPathVariableLookupFunc: @ctxt: an XPath context @name: name of the variable @ns_uri: the namespace name hosting this variable

Prototype for callbacks used to plug variable lookup in the XPath engine.

Returns the XPath object value or NULL if not found.