def _parse_value_id(self, value_id: str) -> Tuple[str, str]:
        """Parse a Vespa value ID into group type and value key."""
        parts = value_id.split(':', 2)
        # if null returned by Vespa, only 2 parts from split
        return parts[1], parts[2] if len(parts) == 3 else None
Parse a Vespa value ID into group type and value key.
src/marqo/core/semi_structured_vespa_index/semi_structured_vespa_index.py