org.hibernate.boot.model.source was developed as an abstraction over the source of mapping information - annotations, orm.xml, hbm.xml with the initial intent of unifying the processing of mapping sources.

This is already how hbm.xml is processed. This work would apply that to annotations and orm.xml processing as well.

The approach has benefits in addition to the processing unification, such as -

1. Avoiding use of library APIs in processing. Ultimately we want to move to Jandex over HCANN for annotation consumption - see https://hibernate.atlassian.net/browse/HHH-9489. Using this abstraction will make that migration much simpler.
2. Allows support for both dynamic models (MAP mode) and entity-name models. This is important for deprecation of hbm.xml in favor of annotations / orm.xml - see https://hibernate.atlassian.net/browse/HHH-15698.