google app engine - Are generated id's unique per entity or for my app's complete datastore? -


i'm using 

@generatedvalue(strategy = generationtype.identity)

in jpa entities let google appengine generate id's entities. wonder if generated unique per entity or app's complete datastore.

the reason i'm asking want use entity's id identifier search documents.

as per docs: ids allocated within namespace defined parent key , kind


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