private static DocapiCommon.DocumentSelection toProtoDocumentSelection(String rawSelection) {
        return DocapiCommon.DocumentSelection.newBuilder()
                .setSelection(rawSelection)
                .build();
    }
Implementation of MessageBus message request/response serialization built around Protocol Buffers.
documentapi/src/main/java/com/yahoo/documentapi/messagebus/protocol/RoutableFactories80.java