for $article in collection(sortiexml-slurp_3208.xml)//article
for $element in $article/element
let $sonfrere := $element/following-sibling::element[1]
let $sonfreresuivant := $element/following-sibling::element[2]
let $sonfreresuivant2 := $element/following-sibling::element[3]
where $element/data[1]="NOM" and $sonfrere/data[1]="PRP" and $sonfreresuivant/data[1]="NOM" and $sonfreresuivant2/data[1]="PRP"
return string-join(($element/data[3], $sonfrere/data[3], $sonfreresuivant/data[3], $sonfreresuivant2/data[3])," ")