Need ability to break data maps into multiple XML files (on entity by entity 
basis)?
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                 Key: CAY-969
                 URL: https://issues.apache.org/cayenne/browse/CAY-969
             Project: Cayenne
          Issue Type: New Feature
          Components: Cayenne Core Library, CayenneModeler GUI
    Affects Versions: UNDEFINED FUTURE
            Reporter: Michael Bergens
            Assignee: Andrus Adamchik


Problem: suppose it takes 5K per small table or twice that (10K) for a bigger 
table definition in the data map file. When the table count shoots up into 
several hundreds, we are looking into datamap XML files several megs big. Now 
suppose you store the Cayenne xmls under a version control and use it to track 
the changes. The size along with natural problems of XML versioning makes it 
very difficult to understand any arbitrary non-trivial change in the past. If 
there was a chance to break those files on entity-by-entity basis, that would 
make change tracking easy.

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