for $adj in //item/a[4]
let $texta := $adj/preceding-sibling::a[2]/text()

let $nom := $adj/parent::item/following-sibling::item[1]/a[4]
let $textn := $nom/preceding-sibling::a[2]/text()

return if($adj/text()='ADJ' and $nom/text()='NOUN')
then string-join(($texta, $textn), ' ')
else ()