Create an XML RelaxNGs parse context for that file/resource
       expected to contain an XML RelaxNGs file.

def relaxNGNewParserCtxt(URL):
    """Create an XML RelaxNGs parse context for that file/resource
       expected to contain an XML RelaxNGs file. """
    ret = libxml2mod.xmlRelaxNGNewParserCtxt(URL)
    if ret is None:raise parserError('xmlRelaxNGNewParserCtxt() failed')
    return relaxNgParserCtxt(_obj=ret)