FW: indexing functions

I posted this message a while ago, but did not receive any response, so
I give it another try. Any pointer would help.

> Is it possible to manipulate the way an index is created by using
> functions? I would like to store SGML data in text fields that include
> a lot of entities (like ü). To enable the user to search the
> ü character as u I would like to index those entities as the
> character without the diacritical marks. Is this possible?
>
> Thanks in advance,
>
> Bas Peters
> bpeters@idc.nl