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- From: Richard Light <richard@light.demon.co.uk>
- To: xml-dev@ic.ac.uk
- Date: Tue, 17 Jun 1997 13:14:06 +0100
Hi,
I'm probably not the only person to have done this, but I had a go at
XML-izing the HTML 2.0 DTD. Most of the job was straightforward
(although a recent exchange suggests that I would have been better
advised to leave the tag omission rules in as parameter entities!).
However, two issues that remain are the use of '&' in the content model
for <HEAD>, and the liberal use of inclusion and exclusion exceptions.
Both are invalid in XML, and neither can be trivially re-mapped to an
XML-compliant equivalent. Is anyone else interested in this sort of
issue? Any thoughts on how these problems should be addressed?
I don't want to waste bandwidth by copying the whole DTD, but if anyone
wants it, I'll happily forward a copy offline. Here are the relevant
sections:
1) This is the relevant fragment for the first issue (the '&' content
models have not been changed):
<![ %HTML.Recommended; [
<!ENTITY % head.extra "">
]]>
<!ENTITY % head.extra "& NEXTID?">
<!ENTITY % head.content "TITLE & ISINDEX? & BASE? %head.extra;">
<!ELEMENT HEAD (%head.content;)>
2) ... and this goes on to show a couple of the exceptions:
<!-- +(META|LINK) exception removed -->
<!-- <HEAD> Document head -->
<!ELEMENT TITLE (#PCDATA)>
<!-- -(META|LINK) exception removed -->
These are the others (all of them, I think):
<!ENTITY % A.content "(%heading;|%text;)*">
<!ELEMENT A %A.content;>
<!-- -(A) exception removed -->
...
<!ELEMENT FORM %body.content;>
<!-- -(FORM) +(INPUT|SELECT|TEXTAREA) exceptions removed -->
...
<!ELEMENT SELECT (OPTION+)>
<!-- -(INPUT|SELECT|TEXTAREA) exception removed -->
...
<!ELEMENT TEXTAREA (#PCDATA)>
<!-- -(INPUT|SELECT|TEXTAREA) exception removed. "*" removed from
content
model. -->
Richard Light
SGML and Museum Information Consultancy
richard@light.demon.co.uk
3 Midfields Walk
Burgess Hill
West Sussex RH15 8JA
U.K.
tel. (44) 1444 232067
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