tg_trigtuple</TT
></DT
><DD
><P
>        A pointer to the row for which the trigger was fired. This is
        the row being inserted, updated, or deleted.  If this trigger
        was fired for an <TT
CLASS="COMMAND"
>INSERT</TT
> or
        <TT
CLASS="COMMAND"
>DELETE</TT
> then this is what you should return
        from the function if you don't want to replace the row with
        a different one (in the case of <TT
CLASS="COMMAND"
>INSERT</TT
>) or
        skip the operation.
       </P
></DD
><DT
><T