> if google app engine has implemented fetch groups as defined in JSR-000243 
> Java Data Objects
> 2.2 Maintenance Release 2 ?

GAE/J uses DataNucleus for the core persistence layer (and GAE/J
providing the layer communicating with the datastore), and DataNucleus
is the "reference implementation" for JDO 2.0, 2.1, 2.2, 2.3, so yes
has implemented that functionality, as per
http://www.datanucleus.org/products/accessplatform_2_0/jdo/fetchgroup.html

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