Yes, hibernate-mapping-4.0.xsd and hibernate-mapping-3.0.dtd. I didn't know about legacy-mapping-4.0.xsd until I grepped the source code for tuplizer. At that point I was tracking down the exception, so I'm not sure if it would have avoided confusion.

Does the hibernate team plan to continue to support hbm.xml files? Or is this feature something that will be phased out eventually?