not null, any event procedures
      registered in the connection are copied into the
      <TT
CLASS="STRUCTNAME"
>PGresult</TT
>.  (They do not get
      <TT
CLASS="LITERAL"
>PGEVT_RESULTCREATE</TT
> calls, but see
      <CODE
CLASS="FUNCTION"
>PQfireResultCreateEvents</CODE
>.)
      Note that <CODE
CLASS="FUNCTION"
>PQclear</CODE
> should eventually be called
      on the object, just as with a <TT
CLASS="STRUCTNAME"
>PGresult</TT
>
      returned by <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> itself.
    