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   Re: HTML != XML (was Re: [ANN] Kludgey workarounds for xt)

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  • From: David Megginson <david@megginson.com>
  • To: "XML Developers' List" <xml-dev@ic.ac.uk>
  • Date: Wed, 9 Sep 1998 14:28:05 -0400

Andrew Bunner writes:

 >   <stating-the-obvious>Java Script engines are not easy things to
 > write.</stating-the-obvious> I think it's unlikely that developers
 > are going to redefine the Java Script language to interpret &lt; as
 > < ... my opinion (hope) is that the standard should accomodate
 > this.

The problem is that the HTML 4.0 DTD defines the <SCRIPT> element as


This is perfectly legal SGML, and HTML 4.0 is based on SGML.  It would
actually be *wrong* to use &lt; and &amp; in a <SCRIPT> element in
HTML -- the browsers, probably by accident, have it right (at least
this far).

Here's the crux, though: HTML 4.0 is based on a non-XML subset of
SGML.  That means that XML cannot represent (and was never intended to
represent) an HTML <= 4.0 document.  It's just wrong.  If you need to
do that, why bother with XML when there are perfectly good HTML/SGML
tools out there?  

XML is *not* an extension of HTML, and there is no safe way to include
XML in an HTML <= 4.0 page (except by reference, using a <LINK>
element or something similar).

All the best,


David Megginson                 david@megginson.com

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