Hey Guys,
I am a big fan of App Engine, but seem to be stuck on a problem: Is
there any option for storing relationships such that entity keys are
not dependent on GAE?

The background:
We are building a web app that we believe our customers would like to
have a core component on their internal networks. Since we would like
to use Google App Engine on our side (for the rest of the users), I am
trying to find the best way for storing relationships that allows the
core data model to not be stuck to only run on the App Engine
platform. When doing this the challenge seems to be finding the best
way to model relationships.

I played with JDO, but since JPA implementations seem to be more
easily available - it seems to be the best option.

The big challenge is in supporting relationships.

The documentation seems to indicate that this is not possible, which
given that JPA exists for increased portability seems surprising to
me. From 
http://code.google.com/intl/pl/appengine/docs/java/datastore/relationships.html
:
"The child class must have a key field whose type can contain the
parent key information: either a Key, or a Key value encoded as a
string."

Will appreciate guidance.

Vineet
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