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<ex3>
{
let $f := doc("university_marks.xml")
let $courses := distinct-values($f//materia)
for $course in $courses
return <course area="{$course}">
{
for $data in $f//libretto
where $data//esami//esame//materia/text()=$course
return <student>{$data//studente/@matricola}</student>
}
</course>
}
</ex3>
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