l result in <TT
CLASS="COMMAND"
>CREATE EXTENSION</TT
>
        failing if no <TT
CLASS="LITERAL"
>VERSION</TT
> option appears, so you generally
        don't want to do that.
       </P
></DD
><DT
><TT
CLASS="VARNAME"
>comment</TT
> (<TT
CLASS="TYPE"
>string</TT
>)</DT
><DD
><P
>        A comment (any string) about the extension.  Alternatively,
        the comment can be set by means of the <A
HREF="sql-comment.html"
>COMMENT</A
>
        command in the script file.
       </P
></DD
><DT
><TT
CLASS="VARN