code: def RelaxNGValidate(self, rng):
          
          ret = libxml2mod.xmlTextReaderRelaxNGValidate(self._o, rng)
          return ret
docs: Use RelaxNG schema to validate the document as it is
            processed. Activation is only possible before the first
            Read(). If @rng is None, then RelaxNG schema validation is
             deactivated.