December 2021 Release
This is the first official "beta" release. We previously created, erroneously, a 1.0 release, but decided to withdraw it, because of an unresolved discussion on how to handle semantic ENUMS (#112).
We are using the 0.9 release version to indicate that there may be some breaking changes introduced before releasing 1.0, but the metadata schema is now stable enough to start building experimental pipelines.