http://code.google.com/appengine/docs/java/datastore/relationships.html

=========
Child objects are loaded from the datastore when they are accessed for
the first time. If you do not access the child object on a parent
object, the entity for the child object is never loaded. (The
datastore interface does not support the "eager" loading of child
objects. The datastore does not support join queries, so an
implementation of eager loading wouldn't save the app a call to the
datastore.)
=========

But it works only if the parent is attached to PersistentManager
(before pm.close).
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