Create an XML RelaxNGs validation context based on the
           given schema

def relaxNGNewValidCtxt(self):
        """Create an XML RelaxNGs validation context based on the
           given schema """
        ret = libxml2mod.xmlRelaxNGNewValidCtxt(self._o)
        if ret is None:raise treeError('xmlRelaxNGNewValidCtxt() failed')
        __tmp = relaxNgValidCtxt(_obj=ret)
        __tmp.schema = self
        return __tmp