Check +Aux, it could maybe work for you.

Search this mailing list and the documentation.

Something I wrote:
http://www.prodevtips.com/2008/10/09/pilog-solve-and-the-aux-relation/

/Henrik


On Wed, Apr 14, 2010 at 9:58 AM, Mateusz Jan Przybylski <
dexen.devr...@gmail.com> wrote:

> Hello,
>
> there is a +Key prefix class for unique index for a relation. As far as I
> understand it, it only works for single attribute of object.
> Is there a reasonably straightforward way to have an index that requires
> uniqueness of tuple/list of two or more attributes?
>
>
> Regards,
> --
> dexen
>
> /* apologies if this mail hits the list two times */
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