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Distinctness on a combination of values

File: Data.xml <order>   <car model="A">     <id>1</id>     <name language="en">name 1</name>   </car>   <car model="B">     <id>2</id>     <name language="en">name 2</name>   </car>   <car model="B">     <id>3</id>     <name language="en">name 3</name>   </car> </order> File: Query.xquery let $prods := doc("Data.xml")//car for $d in distinct-values($prods/@model),     $n in distinct-values($prods[@model = $d]/id) return <result model="{$d}" id="{$n}"/> Output: <?xml version="1.0" encoding="UTF-8"?> <result id="1" model="A"/> <result id="2" model="B"/> <result id="3" model="B"/>