for $element in collection(BAO2_Pl_udpipe3210)//element
where contains($element/data[6]/text(),'obj')
let $id:=$element/data[1]
let $id_gouv:=$element/data[5]
let $dep_token:=$element/data[4]/text()
let $noeudC:=
   if (number($id_gouv) < number($id)) then (
		$element/preceding-sibling::element[number(data[1])=number($id_gouv)]/data[4]/text()
	)
	else (
		$element/following-sibling::element[number(data[1])=number($id_gouv)]/data[4]/text()
	)
return string-join(($noeudC,$dep_token),"&#9;")