def _Z9_of(ZID):
    """Convenience function for creating specialized Z9 types."""
    return {
        "literally": {
            "allOf": [
                {"external": "Z9"},
                {
                    "type": "object",
                    "properties": {
                        "Z9K1": {
                            "type": "string",
                            "enum": [ZID],
                        },
                    },
                },
            ],
        },
    }