<result>{
for $s in document("j_caesar.xml")//SPEAKER
return <speaks>{<who>{$s/text()}</who>,
                for $a in document("j_caesar.xml")//ACT
                where some $s1 in $a//SPEAKER satisfies $s1 eq $s
                return <when>{$a/TITLE/text()}</when>}
       </speaks>
}</result>