1<result> 2 { 3 for $i in doc("items.xml")//item_tuple 4 where empty(doc("bids.xml")//bid_tuple[itemno = $i/itemno]) 5 return 6 <no_bid_item> 7 { $i/itemno } 8 { $i/description } 9 </no_bid_item> 10 } 11</result>