3 for $doc in ('stations.qpl')
4 for $station in doc($doc)//station,
5 $stationcode in doc('stationcodes.qpl')//station[name = $station/name]
14 for $doc in ('stations.qpl')
15 for $station in doc($doc)//station
16 let $stationcode := doc('stationcodes.qpl')//station[name != $station/name]
18 $station/name != $stationcode/name