Re: [xml-dev] Notable declarative expressions?

[u123724 <u123724@gmail.com>]

Sorry but what is this discussion about?

XML Schema is language for describing a grammar, not a "data model"
(whatever that is), even though its being (ab-)used all the time.
Being a grammar, it describes a class of *sequences* over characters
or content tokens.

This is a rather different purpose than, say co-inductive data types
(eg. of programming languages), which can describe an in-memory data
layout where the sequence of symbols isn't necessarily material, and
which can have cyclic pointers.

Or the relational data model which is specified in terms of algebraic
properties of relational operations.

On 12/18/16, John Cowan <johnwcowan@gmail.com> wrote:
> On Sun, Dec 18, 2016 at 1:19 PM, Costello, Roger L. <costello@mitre.org>
> wrote:
>
>> An XML Schema is a model; specifically, a data model. When you create an
>> XML Schema, you are “data modeling.”
>
>
> It's a half-assed mixture of a model and a content schema.
>
> --
> John Cowan          http://vrici.lojban.org/~cowan        cowan@ccil.org
> Andrew Watt on Microsoft:  Never in the field of human computing has so
> much been paid by so many to so few! (pace Winston Churchill)
>