Re: SGML, XML, HTML, etc.

Subject: Re: SGML, XML, HTML, etc.
From: mpriestl -at- ca -dot- ibm -dot- com
To: "TECHWR-L" <techwr-l -at- lists -dot- raycomm -dot- com>
Date: Tue, 5 Jun 2001 12:58:15 -0400

Leslie writes:
>Please provide links to prove your point. Everything I've seen indicates
>that XML is a SGML document type, including materials from IBM.

Please look again. I did post a link to a collection of introductory
material, but one of your own links (the IBM one, for what its worth)
serves the purpose nicely.

>From http://www.cas.ibm.com/archives/1998/workshops/xml.html :

>EXtensible Markup Language (XML) has been described as ``an
>extremely simple dialect of SGML'' which enables generic SGML to be
>"served, received, and processed on the Web in the way that is now
>possible with HTML.'' To be precise, XML itself isn't a language but
rather
>the meta-language and infrastructure for defining other languages.

Please pay particular attention to the last sentence.

Leslie continues:
>There is a DTD (**Document** **Type** Definition) for XML, the
specification
>can be found at www.w3c.org.

No there isn't. There is the XML 1.0 spec, more specifically at
http://www.w3.org/TR/2000/REC-xml-20001006

But that isn't a DTD - it is, in fact, a description of how to create DTDs,
that being the main point of XML.

Perhaps some of the confusion here is because of the two-tier definition of
XML: a "well-formed" XML document consists of an arbitrary set of tags that
have appropriate behavior (matching start and end tags, proper nesting
etc.). A "valid" XML document consists of a specific set of tags that
conform to a specific DTD. In neither case, however, is there anything like
an "XML DTD", that defines the tagset for all possible XML documents.

Michael Priestley
DITA Specialization Architect
mpriestl -at- ca -dot- ibm -dot- com
Dept 833 IBM Canada t/l: 778-3233 phone: 416-448-3233
Toronto Information Development


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