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