Yeah, to be honest, I think the most difficult thing will be to determine what is the previous stable.

I didn't even think of automating this. I would just make it a build parameter, to be filled in manually.

For OGM, I used xmlstarlet in the Travis build: https://github.com/hibernate/hibernate-ogm/blob/master/.travis.yml#L25

Ok, I'll open a PR with this tool, then.