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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 get_schema_node(self, path: SchemaPath) -> Optional[SchemaNode]: """Return the schema node addressed by a schema path. Args: path: Schema path. Returns: Schema node if found in the schema, or ``None``. Raises: InvalidSchemaPath: If the schema path is invalid. """

        return self.schema.get_schema_descendant(
            self.schema_data.path2route(path))