langchain/graphs/neo4j_graph.py/Neo4jGraph/refresh_schema
class Neo4jGraph:    def refresh_schema(self) -> None:
        """
        Refreshes the Neo4j graph schema information.
        """
        node_properties = self.query(node_properties_query)
        relationships_properties = self.query(rel_properties_query)
        relationships = self.query(rel_query)

        self.schema = f"""
        Node properties are the following:
        {[el['output'] for el in node_properties]}
        Relationship properties are the following:
        {[el['output'] for el in relationships_properties]}
        The relationships are the following:
        {[el['output'] for el in relationships]}
        """