MetadataSources currently allows adding orm.xml/hbm.xml files to be parsed, using their path or an input stream. It also exposes a XmlMappingBinderAccess, allowing us to parse such a file ourselves.

But it does not allow us to add that pre-parsed file to the metadata sources. That would be as easy as exposing a three-line method, and integrators would benefit from this because they would then be able to parse files ahead of time (i.e. at compile time) and to skip parsing at runtime.