Siena is a persitence library for Java inspired on the Google App Engine datastore.
* intrusive. You make a class persistent by extending a certain class. Relationships are defined also in an intrusive way.
* simple. Simplicity is the most important thing.
* limited. Due to the simplicity there are several unsupported things such as JOINs.
* extensible. There are two interfaces you can implement on your own way.
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