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From "Patrick Linskey" <plins...@bea.com>
Subject RE: OpenJPA annotations XML
Date Tue, 05 Dec 2006 17:30:53 GMT
> As you have pointed out, this gets a bit trickier due to the 
> xml schema
> definitions for the orm.xml file.  We can't just define new 
> stanzas and
> expect the orm.xml files to be portable across persistence providers.

But do we care? That is, how do we want to balance portability vs. ease
of use?

Put another way, if we were to define schema extensions, we could
presumably allow both interleaving of the contents as in my example and
parallel files, so that people could choose how they wanted to
configure. This would have the downside of allowing multiple
configuration mechanisms, but would allow the upside of letting people
use one file instead of two if they so desired.

> Your second guideline was a surprise to me.  Are you saying that if an
> application is using orm.xml to override certain 
> spec-compliant annotations,
> then the OpenJPA annotations are also ignored?  

Currently, I believe that that is the case.

> If I am reading that right,
> then isn't this just a bug that needs to be resolved?  

Yes, but the fix has implications on behavior in the future, if we
decide to have a single file instead of multiple.

> Does OpenJPA provide
> alternative annotation support for the JPA spec-compliant 
> annotations?  I
> knew we provided additional annotations, but I wasn't aware 
> that we overrode
> JPA annotations.

No, OpenJPA doesn't provide any way to override JPA annotations /
descriptor elements.

> On a related note...  Will the xml-mapping-metadata-complete 
> element apply
> to the openjpa annotations as well?

If we put contents into the same file, I'd say yes. If we put contents
into a different file, dunno. Maybe we'd want to have another
xml-mapping-metadata-complete stanza there too.

-Patrick
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