declare copy-namespaces preserve, no-inherit; declare boundary-space preserve; copy $data := modify insert node into $data return let $w := $data/w let $x := $w/x let $y := $x/y let $z := $y/z return {namespace-uri-for-prefix("a", $w), namespace-uri-for-prefix("b",$w)} {namespace-uri-for-prefix("a", $x), namespace-uri-for-prefix("b",$x)} {namespace-uri-for-prefix("a", $y), namespace-uri-for-prefix("b",$y)} {namespace-uri-for-prefix("a", $z), namespace-uri-for-prefix("b",$z)}