n(P(edge-element-presence-none,=,root:http://www.sleepycat.com/2002/dbxml.order),V(node-element-equality-double,total,>,'11000'),P(node-element-equality-string,prefix,customer_id)) n(V(node-element-equality-string,customer_id,=,'[to be calculated]'),P(edge-element-presence-none,=,root:http://www.sleepycat.com/2002/dbxml.order))