(: ------------------------------------------ Use Case "R" : Access to Relational Data ------------------------------------------ :) declare variable $users := doc("docs/users.xml"); declare variable $items := doc("docs/items.xml"); declare variable $bids := doc("docs/bids.xml"); declare function local:bid_summary() as element()* { for $i in distinct-values($bids//itemno) let $b := $bids//bid_tuple[itemno = $i] return <bid_count> <itemno>{ $i }</itemno> <nbids>{ count($b) }</nbids> </bid_count> };