D(node-metadata-equality-string,name:http://www.sleepycat.com/2002/dbxml,=,'users.xml',P(edge-element-equality-string,prefix,user_tuple.userid)) D(node-metadata-equality-string,name:http://www.sleepycat.com/2002/dbxml,=,'bids.xml',P(edge-element-equality-string,prefix,bid_tuple.userid)) P(edge-element-equality-string,prefix,user_tuple.userid) P(edge-element-equality-string,prefix,user_tuple.userid)