Re: Evolution of Date's "Abstract Machine" (via CM)

From: Paul <paul_at_test.com>
Date: Sat, 04 Jun 2005 11:09:59 +0100
Message-ID: <42a17df8$0$15021$ed2619ec@ptn-nntp-reader02.plus.net>

mountain man wrote:
> In certain papers, Date uses the terms "abstract machine"
> and "data model" interchangeably, and in the following
> article he exchanges the use of these terms in his very
> definitions:
>
> Quoting Date from here:
> http://www.oreilly.com/catalog/databaseid/chapter/ch01.pdf
>
> "DEFINITION:
>
> A data model is an abstract, self-contained, logical definition
> of the data structures, data operators, and so forth, that
> together make up the _abstract_machine_ with which the
> users interact."

Maybe he's saying that the data model is the logical or theoretical part, and the abstract machine is the actual implementation of the data model - i.e. the DBMS?

Paul. Received on Sat Jun 04 2005 - 05:09:59 CDT