(select
 (bgp
   (triple #S(SPOCQ:BLANK-NODE :ID COMMON-LISP:NIL :LABEL "a") ?:p ?:v)
   (triple #S(SPOCQ:BLANK-NODE :ID COMMON-LISP:NIL :LABEL "a") ?:q 1))
 (?:p ?:v ?:q))