let $ms:=doc("movies_alone.xml"),
    $as:=doc("artists_alone.xml")

return <results> {

for $m in $ms//movie[count(actor)>=2]
return <result> {
  $m/title,
  $m/actor[2>=position()],
  if (count($m/actor)>2) then <et-al/> else ()
} </result>
} </results>