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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def schemaValidCtxtGetParserCtxt(self):
 """allow access to the parser context of the schema validation context """

        ret = libxml2mod.xmlSchemaValidCtxtGetParserCtxt(self._o)
        if ret is None:raise parserError('xmlSchemaValidCtxtGetParserCtxt() failed')
        __tmp = parserCtxt(_obj=ret)
        return __tmp