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]
    return if ($x/data[1]/string() = 'NAM' and $y/data[1]/string() = 'NAM')
then concat($x/data[3]/string(), ' ',$y/data[3]/string())
else()