Right now the proto-google-cloud-xxx dependencies (eg dialogflow ) only include the generated source files. This makes impossible to import the source protos in your protos in an easy way.

For instance, the workaround for using protobuf-maven-plugin is to add this repository as a submodule and configure the plugin to lookup the proto files.

Adding the protos would make working with the libraries easier. Also, this is done for other Google artifacts.