def known(self, node):
ref = node.get('<STR_LIT:type>', Namespace.xsins)<EOL>if ref is None:<EOL><INDENT>return None<EOL><DEDENT>qref = qualify(ref, node, node.namespace())<EOL>query = BlindQuery(qref)<EOL>return query.execute(self.schema)<EOL>
resolve type referenced by @xsi:type