typedef xmlXPathObjectPtr (* | xmlXPathVariableLookupFunc |
xmlXPathVariableLookupFunc: Prototype for callbacks used to plug variable lookup in the XPath engine.
Returns the XPath object value or NULL if not found.
typedef xmlXPathFunction (* | xmlXPathFuncLookupFunc |
xmlXPathFuncLookupFunc: Prototype for callbacks used to plug function lookup in the XPath engine.
Returns the XPath function or NULL if not found.
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