/* (Q15) List names of users who have placed multiple bids of at least $100 each. */ ( FOR $u IN document("RainbowCore/Kweelt/R/users.xml")//user_tuple LET $b := document("RainbowCore/Kweelt/R/bids.xml")//bid_tuple [userid = $u/userid AND bid/text() GEQ 100] WHERE count($b) GT 1 RETURN $u/name/text() )