ConstReadonlyFORMAT_AVRO: "FORMAT_AVRO"Avro-encoded schema.
ReadonlyFORMAT_JSON: "FORMAT_JSON"JSON-encoded schema.
ReadonlyFORMAT_PROTOBUF: "FORMAT_PROTOBUF"Protobuf-encoded schema.
ReadonlyFORMAT_UNSPECIFIED: ""Default value. Format is not set; the request will be rejected.
Supported serialization formats for a schema registry schema.