--
 {}</PRE
><P>
   </P
><P
>    We can also choose to return <TT
CLASS="LITERAL"
>NULL</TT
>, instead of the lower-cased
    word, if it is not found in the stop words file.  This behavior is
    selected by setting the dictionary's <TT
CLASS="LITERAL"
>Accept</TT
> parameter to
    <TT
CLASS="LITERAL"
>false</TT
>.  Continuing the example:

</P><PRE
CLASS="SCREEN"
>ALTER TEXT SEARCH DICTIONARY public.simple_dict ( Accept = false );

SELECT ts_lexize('public.simple_dict','YeS');
 ts_lexize
-----------


SE