TERAL"
>TRUNCATE</TT
>.
      </P
></DD
><DT
><TT
CLASS="LITERAL"
>TD["when"]</TT
></DT
><DD
><P
>       contains one of <TT
CLASS="LITERAL"
>BEFORE</TT
>, <TT
CLASS="LITERAL"
>AFTER</TT
>, or
       <TT
CLASS="LITERAL"
>INSTEAD OF</TT
>.
      </P
></DD
><DT
><TT
CLASS="LITERAL"
>TD["level"]</TT
></DT
><DD
><P
>       contains <TT
CLASS="LITERAL"
>ROW</TT
> or <TT
CLASS="LITERAL"
>STATEMENT</TT
>.
      </P
></DD
><DT
><TT
CLASS="LITERAL"
>TD["new"]</TT
><BR><TT
CLASS="LITERAL"
>TD["old"]</TT
></DT
><DD
><