> I always introduce JPA as a subset of JDO, which is true in terms of > concepts
A while back we compiled a table of the differences (between JDO2 and JPA1) to assist users in choosing what they want. You can find it here :- http://www.jpox.org/docs/persistence_technology.html The table is not exhaustive (since we only come to features as we implement them). For example JPA1 doesn't allow control of specification of foreign-keys, or indexes whereas JDO2 does - will add this. I use this table as a basis for defining JPA1 being a subset of JDO2, and as a basis for defining what JDO2 requires to be a true superset. If anyone has items to add to that table we'd be happy to update it. HTH -- Andy
