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Re: documenting schemas/DTDs

  • From: edwsm@u...
  • To: "Steven R. Newcomb" <srn@t...>
  • Date: Fri, 19 Nov 1999 09:37:36 -0500

Re: documenting schemas/DTDs
There's another school which holds that "syntax IS semantics".

A DTD for X.509 certificates allows me to express what parts of the
certificate I consider required, what parts of the certificate I consider
optional, as well as the legal forms of the parts themselves.

I can tell whether or not a certificate is valid, and also *why* (e.g. no
signature algorithm name was provided, the "not after" date was malformed).
I think that if I can answer "why" questions, I'm operating in the semantic
realm.

Meaning may only be conveyed (manifested?) in "running code or
human-readable prose", but the meaning is latent in the syntax, and
couldn't be conveyed if it wasn't already there.

Ed Smierciak



"Steven R. Newcomb" <srn@t...>@ic.ac.uk on 11/18/99 10:19:34 PM

Please respond to "Steven R. Newcomb" <srn@t...>

Sent by:  owner-xml-dev@i...


To:   tbray@t...
cc:   xml-dev@i...
Subject:  Re: documenting schemas/DTDs



[Tim Bray:]

> DTD's and XML Schemas both are *just syntax*
> dammit, and syntax is not interesting.  XML, at the end of the day, is
not
> interesting.  Messages that convey meaning are interesting.  Meaning is
> only conveyed by
>
>  (a) running code, or
>  (b) human-readable prose.
>
> To generate (a), you have to have (b) first.
>
> End of the story. -Tim

I too am moved to underline this sentiment.   Hear!   Hear!   Hear!

-Steve

--
Steven R. Newcomb, President, TechnoTeacher, Inc.
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