This page shows how to do "simple joins"
http://gae-java-persistence.blogspot.com/2010/03/executing-simple-joins-across-owned.html

However, is there a way to join the same child element twice to check
for a child element that contains 2 specific items, like I'm trying to
do here but failing/returning 0 results?

javax.jdo.Query q5 = pm2.newQuery("select key from " +
Document.class.getName()
                                + " where "
                                + "DocumentSearchKeyValues.contains(dskv) &&
dskv.DocumentSearchKey_Value == 'key 3 - sample value'"
                                + " && DocumentSearchKeyValues.contains(dskv2) 
&&
dskv2.DocumentSearchKey_Value == 'test key 2 - sample value'"
                                );
                q5.declareVariables(DocumentSearchKeyValue.class.getName() + " 
dskv;
" + DocumentSearchKeyValue.class.getName() + " dskv2");
                List<Key> q5_results = (List<Key>) q5.execute();

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