for $item in collection("sortieudpipe-slurp_3208.xml")//item
where contains($item/a[8]/text(),'obj')
let $formedependant:=$item/a[2]/text()
let $positiondependant:=$item/a[1]/text()
let $positiongouverneur:=$item/a[7]/text()
let $formegouverneur:=
if(number($positiongouverneur) >number($positiondependant)) then ($item/following-sibling::item[a[1]=$positiongouverneur]/a[2]/text())
else($item/preceding-sibling::item[a[1]=$positiongouverneur]/a[2]/text())
let $pattern:=string-join(($formegouverneur,$formedependant)," ")
group by $grp:=$pattern
order by count ($pattern) descending
return string-join(($grp,count($pattern)),"	")