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