Re: The Practical Benefits of the Relational Model

Peter Koch Larsen wrote:
>
> built around the Date/Darwen hypothetical D language.

        Only that it isn't. Their language isn't the same as Dataphor's. They propose the Tutorial D language just as a mock-up, and Alphora decided to implement its D differently, but still a valid TTM D.

        D is a generic name for any language conforming to TTM's prescriptions & proscriptions.

> 4) Furthermore I do not consider the relational model well defined -
> and certainly not in "The Third Manifesto".

        Why not, specifically? It is certainly still evolving, and there are at least two lines of thought represended by Eduard F "Ted" Codd, Lee Fesperman and others on one hand and Date, Darwen & Pascal on the other.   But I fail to see how this would detract from its being well defined.

-- 
  _
/ \ Leandro Guimarães Faria Corsetti Dutra        +41 (21) 216 15 93
\ / http://homepage.mac.com./leandrod/        fax +41 (21) 216 19 04
  X  http://tutoriald.sourceforge.net./      Orange Communications CH
/ \ Campanha fita ASCII, contra correio HTML      +41 (21) 644 23 01