declare option saxon:output "indent=yes";
<rich xmlns:pets="http://www.fi.muni.cz/~bar/pets"
      xmlns:devs="http://www.fi.muni.cz/~bar/devices">
{
  for $rich_person in //person
  where sum($rich_person//pets:price) gt 100000 or
  sum($rich_person//devs:price) gt 150000
  return
  <rich-person name="{$rich_person/@name}">
	<pets-value>
 	 {
		sum($rich_person//pets:price)
	 }
        </pets-value>
	<devs-value>
	{
		sum($rich_person//devs:price)
	}
	</devs-value>
  </rich-person>
}
</rich>