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