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To support older TopLink deployment XML we will need to implement a conversion tool that will take an EclipseLink/TopLink Project and convert it into an XMLEntityMappings object. This conversion tool will in turn be used to fulfill the requirement that the Mapping Workbench write out only the new metadata schema format.
All unmapped attributes need to be marked as transient to be consistent with legacy support when converting older TopLink deployment XML to the new format. Since the project does not track/reference unmapped attributes, either the class needs to be loaded (which may not be possible) or a solution to 211330 found.
Updating priority due to revised bug categorization process. See the following page for details: http://wiki.eclipse.org/EclipseLink/Development/Bugs/Guidelines#Priority_and_Target_Milestone If you feel the updated priority is incorrect, please send an email to eclipselink-users@eclipse.org.
In response to Comment #1 eclipselink-orm_2_0.xsd added a flag to the persistence-unit-metadata element called exclude-default-mappings (bug 211330). This was added after Chris's comment, just wanted to bring up that it is no longer a technical issue to fixing this bug. I'm sure there are still plenty of other technical issues :)
The Eclipselink project has moved to Github: https://github.com/eclipse-ee4j/eclipselink