xpath

#define     XPATH_UNDEFINED

#define     XPATH_NODESET

#define     XPATH_BOOLEAN

#define     XPATH_NUMBER

#define     XPATH_STRING

void        (*xmlXPathFunction)             (xmlXPathParserContextPtr ctxt,
                                             int nargs);

xmlXPathContextPtr xmlXPathNewContext       (xmlDocPtr doc,
                                             void *variables,
                                             void *functions,
                                             void *namespaces);

void        xmlXPathFreeContext             (xmlXPathContextPtr ctxt);

xmlXPathObjectPtr xmlXPathEval              (const CHAR *str,
                                             xmlXPathContextPtr ctxt);

void        xmlXPathFreeObject              (xmlXPathObjectPtr obj);

xmlXPathObjectPtr xmlXPathEvalExpression    (const CHAR *str,
                                             xmlXPathContextPtr ctxt);