Re: PSGML's syntax table for HTML error in XEmacs 21.1

Monday, 13 November 2000

        ...
>>>> "Jerry" == Jerry James
<james(a)eecs.ukans.edu&gt; writes: 
    Gleb> It seems like I hit the problem previously reported in
    Gleb> http://www.xemacs.org/list-archives/xemacs-beta/200009/msg00153.html

    Jerry> The problem there was that Stephen had an old version of
    Jerry> PSGML installed.  You appear to have the latest version,
    Jerry> however.  Also note that Stephen's problem was with XML,
    Jerry> but your patch modifies sgml-parser-syntax.  If you look at
    Jerry> the code in psgml-parse.el just after your patch, you will
    Jerry> see that the colon *is* in xml-parser-syntax.  So this does
    Jerry> not seem to be the problem previously reported.

Hi Jerry,

The way I read it, Stephen's problem is exact same one I am reporting.
Let me try to provide more detail.

    Jerry> What, exactly, were you trying to do, and what did PSGML do
    Jerry> that you consider incorrect?

Basically, I wanted to migrate my HTML documents from "-//W3C//DTD
HTML 4.0 Transitional//EN" to "-//W3C//DTD XHTML 1.0
Transitional//EN".  Both are types of HTML.  The latter also happens
to be XML (XHTML is supposed to be an intersection of HTML spec and
XML spec).

I had old PSGML packages which did not include XHTML DTDs, so I
upgraded all the packages to the latest versions.  Then I tried to
validate a small XHTML document:

    Jerry> Can you give some example SGML that shows the problem?

<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN">
<html>
  <head>
    <title>My Title</title>
  </head>

  <body>
    <h1>My Title</h1>
  </body>
</html>

Save this to a file xhtml_test.html.  Open it.  Run C-c C-p
`sgml-parse-prolog'.  At this point PSGML attempted to compile
xhtml1-transitional.dtd, and barfed while parsing it (i.e. while
parsing the DTD not the XHTML test document).  The backtrace for this
is in my original message.

After much scratching my head, I figured out that lines of the form:
       xml:lang language code (as per XML 1.0 spec) 
in xhtml1-transitional.dtd were causing the parsing error.  When I
removed these lines, PSGML was able to parse and compile the DTD.  The
reason parsing of this DTD fails seems to be that PSGML uses
sgml-parser-syntax to parse the DTD and it considers ':' a terminator
for the token.  So adding ':' to sgml-parser-syntax got rid of the
problem for me.

    Jerry>  Finally, if this really is a problem with PSGML, it should
    Jerry> also be reported to Lennart Staflin, the PSGML maintainer.

The way I read Stephen's message, it worked for him in 21.2.  If this
works in 21.2 but not in 21.1, I figure XEmacs team should have the
first try.

Gleb

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