I am also new to JDO :) but this is what I am doing currently:
By setting @Persistent(defaultFetchGroup = "true") on the child/
children loading the parent will automatically load all children ...
Does this help? Or do you need to get children only without their
parent ?

See =>
http://code.google.com/intl/de-DE/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. If you want
to load the child, you can either "touch" it before closing the
PersistenceManager (e.g. by calling getContactInfo() in the above
example) or explicitly add the child field to the default fetch group
so it's retrieved and loaded with the parent:"

@Persistent(defaultFetchGroup = "true")

regards
hani

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