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>41.2. Trigger Functions</A
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>   When a function is used as a trigger, the dictionary
   <TT
CLASS="LITERAL"
>TD</TT
> contains trigger-related values.  The trigger
   rows are in <TT
CLASS="LITERAL"
>TD["new"]</TT
> and/or <TT
CLASS="LITERAL"
>TD["old"]</TT
>
   depending on the trigger event.  <TT
CLASS="LITERAL"
>TD["event"]</TT
> contains
   the event as a string (<TT
CLASS="LITERAL"
>INSERT</TT
>, <TT
CLASS="LITERAL"
>UPDATE</TT
>,
   <TT
CLASS="LITERAL"
>DELETE</TT
>, or <TT
CLASS="LITERAL"
>UNKNOWN</TT
>).
   <TT
CLASS="LITERAL"
>TD["when"]</TT
> contains one of <TT
CLASS="LITERAL"
>BEFORE</TT
>,
   <TT
CLASS="LITERAL"
>AFTER</TT
>, and <TT
CLASS="LITERAL"
>UNKNOWN</TT
>.
   <TT
CLASS="LITERAL"
>TD["level"]</TT
> contains one of <TT
CLASS="LITERAL"
>ROW</TT
>,
   <TT
CLASS="LITERAL"
>STATEMENT</TT
>, and <TT
CLASS="LITERAL"
>UNKNOWN</TT
>.
   <TT
CLASS="LITERAL"
>TD["name"]</TT
> contains the trigger name,
   <TT
CLASS="LITERAL"
>TD["table_name"]</TT
> contains the name of the table on which the trigger occurred,
   <TT
CLASS="LITERAL"
>TD["table_schema"]</TT
> contains the schema of the table on which the trigger occurred,
   <TT
CLASS="LITERAL"
>TD["name"]</TT
> contains the trigger name, and
   <TT
CLASS="LITERAL"
>TD["relid"]</TT
> contains the OID of the table on
   which the trigger occurred.  If the <TT
CLASS="COMMAND"
>CREATE TRIGGER</TT
> command
   included arguments, they are available in <TT
CLASS="LITERAL"
>TD["args"][0]</TT
> to
   <TT
CLASS="LITERAL"
>TD["args"][(<TT
CLASS="REPLACEABLE"
><I
>n</I
></TT
>-1)]</TT
>.
  </P
><P
>   If <TT
CLASS="LITERAL"
>TD["when"]</TT
> is <TT
CLASS="LITERAL"
>BEFORE</TT
>, you can
   return <TT
CLASS="LITERAL"
>None</TT
> or <TT
CLASS="LITERAL"
>"OK"</TT
> from the
   Python function to indicate the row is unmodified,
   <TT
CLASS="LITERAL"
>"SKIP"</TT
> to abort the event, or <TT
CLASS="LITERAL"
>"MODIFY"</TT
> to
   indicate you've modified the row.
  </P
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