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Re: conformance constraints on producers that go beyond syntax

From: Henry S. Thompson <ht@inf.ed.ac.uk>
Date: Mon, 21 Sep 2009 16:43:03 +0100
To: Jonathan Rees <jar@creativecommons.org>
Cc: www-tag@w3.org, Alan Ruttenberg <alanruttenberg@gmail.com>
Message-ID: <f5bljk8nw1k.fsf@hildegard.inf.ed.ac.uk>
Hash: SHA1

Jonathan Rees writes:

> (On an unrelated point - is the above requirement part of HTML4?

Indirectly, at least, yes, insofar as HTML4 is an SGML application.

The SGML spec. defines the 'document type definition' of an SGML
application as specifying both the syntax _and_ semantics of the tags
defined by that application, and documents are supposed to conform to
document type definitions.  Violation of this is colloquially called
'tag abuse', i.e. using a tag for other than its documented purpose
and is recognised in at least the old-school markup community (see
e.g. [1]) as a Bad Thing.


[1] http://www.xmlgrrl.com/publications/DSDTD/ch04.html#tag.abuse
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       Henry S. Thompson, School of Informatics, University of Edinburgh
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Received on Monday, 21 September 2009 15:43:50 UTC

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