Hi Perry, Well, after the bunch of messages talking about an *apparently* silly question, I must say that I mostly agree with your last proposal. The only thing that I strongly miss is that you are not decided to include the "titles" parameter to the constructor and the respective attribute. In my opinion, this would allow to forbid declaring illegal names as field names and provide full access to all attributes in *all* the ways you proposed. I think this is another kind of metainformation than just units, display formats, etc. A "titles" atttribute is about providing functionality, not just adding information. But, as you said, there will be always somebody not completely satisfied ;) Anyway, thanks for listening to all of us and put some good sense in all the mess that provoked the discussion. Cheers, -- Francesc Alted