for $element in doc("bao2_TT_pl_3246.xml")//item/(description|titre)/element
let $frere1:= $element/following-sibling::element[1]
let $frere2:= $element/following-sibling::element[2]
where (($element/data[1][contains(text(),'NOM')]) and ($frere1/data[1][contains(text(),'PRP')]) and ($frere2/data[1][contains(text(),'NOM')]))
return string-join(($element/data[3], $frere1/data[3], $frere2/data[3])," ")