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RE: DTD for protocol-03?

From: Judith Slein <slein@wrc.xerox.com>
Date: Tue, 7 Oct 1997 07:49:50 PDT
Message-Id: <>
To: Martin J. Dürst <mduerst@ifi.unizh.ch>@parc.xerox.com
Cc: Yaron Goland <yarong@microsoft.com>, "'ejw@ics.uci.edu'" <ejw@ics.uci.edu>, "'Terry Allen'" <tallen@sonic.net>, "'w3c-dist-auth@w3.org'" <w3c-dist-auth@w3.org>
I agree with Martin, that if we are relying on XML, we should use the
official mechanism for defining XML syntax -- a DTD.  Putting it into the
specification soon would allow a thorough review of the details of the syntax.


At 05:15 AM 10/7/97 PDT, Martin J. Dürst wrote:
>On Mon, 6 Oct 1997, Yaron Goland wrote:
>> DTDs are NOT necessary for XML and in fact are seen as being deprecated
>> by many parts of the XML community.
>... while they are highly valued by other parts of that community :-).
>> Furthermore the DTD syntax is not
>> well known amongst the HTTP community, of which DAV is a member, while
>> BNF is.
>> Given that providing a DTD is not necessity for XML and that we will
>> still have to provide our current syntax I propose that we add DTDs, as
>> an appendix, to the final draft. Until we reach that final draft, there
>> is little point in having to maintain two sets of definitions.
>A DTD is indeed not necessary for many kinds of processing of XML,
>due to certain enhancements in XML that where not present in SGML originally.
>However, a DTD not only provides a written definition of an XML
>application, it also allows to use tools to a much greater extent
>than a BNF. With a DTD and a piece of XML, you can check whether
>the XML conforms to the DTD with tools that are both publicly
>available or commercial.
>Also, it is very clear that a DTD is the official way to define
>some XML syntax. The problem is that the expressibility of a
>DTD is not exactly the same as that of a BNF. There are some
>cases that are easier to specify in a DTD, and others that are
>easier to do in a BNF. But having two different specifications
>in the WEBDAV spec is of course not desirable. That's why I
>think it makes a lot of sense to try to start with a DTD
>early on. We don't need to repeat the mistakes Netscape made
>with HTML.
>Regards,	Martin.
Name:			Judith A. Slein
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Received on Tuesday, 7 October 1997 10:52:44 UTC

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