> Thank you for not giving any links that confinces me that it is a > "must have".
Gosh. I already gave you the search term for Google (quotation marks included!) or for the index of any decent database design textbook. You're really not too embarrassed to exhibit that kind of attitude? Do you really pretend to be a software developer? Or that you want to sell software products or services? Are you really not aware what kind of impression you give to any potential customer (or module developer) who just happens to have a clue by chance? Sincerely, Wolfgang
