D(node-metadata-equality-string,name:http://www.sleepycat.com/2002/dbxml,=,'bib.xml',U) D(node-metadata-equality-string,name:http://www.sleepycat.com/2002/dbxml,=,'reviews.xml',V(edge-element-equality-string,entry.title,=,'[to be calculated]')) V(edge-element-equality-string,entry.title,=,'[to be calculated]') P(edge-element-equality-string,prefix,book.title) P(edge-element-equality-string,prefix,book.title)