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