(select
 (bgp
   (triple ?:x <http://example/ns#p>
           #S(SPOCQ:UNSUPPORTED-TYPED-LITERAL
              :ID COMMON-LISP:NIL
              :LEXICAL-FORM "a"
              :DATATYPE-URI <http://example/t#type1>
              :CONDITION COMMON-LISP:NIL)))
 (?:x))