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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 parseDoc(self, doc_str, format="xml"):
 """Parse a OAI-ORE Resource Maps document. See Also: ``rdflib.ConjunctiveGraph.parse`` for documentation on arguments. """

        self.parse(data=doc_str, format=format)
        self._ore_initialized = True
        return self