Parse an URI reference string based on RFC 3986 and fills
          in the appropriate fields of the @uri structure
           URI-reference = URI / relative-ref

def parseURIReference(self, str):
        """Parse an URI reference string based on RFC 3986 and fills
          in the appropriate fields of the @uri structure
           URI-reference = URI / relative-ref """
        ret = libxml2mod.xmlParseURIReference(self._o, str)
        return ret