(ask
 (join
  (join
   (bgp
     (triple #S(SPOCQ:BLANK-NODE :ID COMMON-LISP:NIL :LABEL "who")
             <http://xmlns.com/foaf/0.1/homepage> ?::homepage))
   (union
    (bgp
      (triple ?::someone <http://xmlns.com/foaf/0.1/made> ?::homepage))
    (bgp
      (triple ?::homepage <http://xmlns.com/foaf/0.1/maker> ?::someone))))
  (bgp
    (triple #S(SPOCQ:BLANK-NODE :ID COMMON-LISP:NIL :LABEL "who")
            <http://xmlns.com/foaf/0.1/schoolHomepage> ?::schoolPage))))