| (: XQuery Join Aggregate Query :) | |
| (: Count all stations in the state of Oregon. :) | |
| count( | |
| let $station_collection := "../../../../../../../weather_data/dataset-tiny-local/data_links/local_speed_up/d0_p1_i0/stations/?select=*.xml;recurse=yes" | |
| for $s in collection($station_collection)/root/stationCollection/station | |
| where (some $x in $s/locationLabels satisfies ($x/type eq "ST" and fn:upper-case(fn:data($x/displayName)) eq "OREGON")) | |
| return $s | |
| ) |