for $item in db:open("Test","3260.xml")/rubrique/item
    for $content in $item/*
    for $elem at $pos in $content/element
    let $x := $content/element[$pos]
    let $y := $content/element[$pos+1]
    let $z := $content/element[$pos+2]
    return if ($x/data[1]/string() = 'NOM' and ($y/data[1]/string() = 'PRP' or $y/data[1]/string() = 'PRP:det') and $z/data[1]/string() = 'NOM')
then concat($x/data[3]/string(), ' ',$y/data[3]/string(), ' ',$z/data[3]/string())
else()