n(P(edge-element-presence-none,=,root:http://www.sleepycat.com/2002/dbxml.items),V(edge-attribute-equality-string,item.@id,=,'8')) P(edge-element-presence-none,=,root:http://www.sleepycat.com/2002/dbxml.items) P(edge-attribute-equality-string,prefix,item.@id)