function is passed a
   <TT
CLASS="LITERAL"
>checkUnique</TT
> parameter having one of the following values:

    <P
></P
></P><UL
><LI
><P
>       <TT
CLASS="LITERAL"
>UNIQUE_CHECK_NO</TT
> indicates that no uniqueness checking
       should be done (this is not a unique index).
      </P
></LI
><LI
><P
>       <TT
CLASS="LITERAL"
>UNIQUE_CHECK_YES</TT
> indicates that this is a non-deferrable
       unique index, and the uniqueness check must be done immediately, as
       described above.
      </P
></LI