File: Data.xml
<employees>
<employee name="James" salary="1234" yearServed="1" location="North"/>
<employee name="Joe" salary="3211" yearServed="2" location="South"/>
<employee name="Jod" salary="3422" yearServed="3" location="North"/>
<employee name="Jason" salary="1321" yearServed="4" location="East"/>
<employee name="Jack" salary="2324" yearServed="3" location="North"/>
<employee name="Jeep" salary="4321" yearServed="2" location="East"/>
<employee name="Jane" salary="2344" yearServed="1" location="South"/>
</employees>
File: Query.xquery
for $d in distinct-values(doc("Data.xml")//employee/@location)
let $employees := doc("Data.xml")//employee[@location= $d]
order by $d
return <department name="{$d}" total="{sum($employees/@yearServed)}"/>
Output:
<?xml version="1.0" encoding="UTF-8"?>
<department total="6" name="East"/>
<department total="7" name="North"/>
<department total="3" name="South"/>
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