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- From: "Frank Boumphrey" <bckman@ix.netcom.com>
- To: <xml-dev@xml.org>, "Peter Murray-Rust" <peter@ursus.demon.co.uk>
- Date: Sun, 2 Apr 2000 12:55:08 -0400
For XHTML only, if you change the suffix to 'htm' you will not get this
behavior. In the XHTML WG we were a little worried that when XHTML became
popular as XML the W3C site would not be able to cope with all the calls to
the DTD!
But i agree with you, this is a problem, when one is of line one either has
to comment out the DOCTYPE declaration or not.
The MSXML parser incidently has the option to switch of expansion of
external entities, and i believe this option is available in the latest
releases of IE5 ( but I havnt tried this.)
I believe that the correct solution is to have all parsers give this option
to the client.
The other solution would require a change to XML. IOW allow the resolution
URL to be optional, and let just a public Declaration be used. Conforming
parsers could then be instructed that they should only validate if the URI
is given.
Frank
Frank
----- Original Message -----
From: Peter Murray-Rust <peter@ursus.demon.co.uk>
To: <xml-dev@xml.org>
Sent: Sunday, April 02, 2000 5:22 AM
Subject: Parser Behaviour (serious)
> <Note>This message is serious<smiley/></Note>
>
> I have been preparing a large amount of XHTML (for our VirtualXML
activity)
> and using Dave Raggett's excellent tidy program (with option -asxml) to
> produce XHTML files of the sort:
>
> <?xml version="1.0"?>
> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
> "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
> <html xmlns="http://www.w3.org/1999/xhtml">
> <head>
> <title>Test page</title>
> </head>
> <body>
> <p>A test</p>
> </body>
> </html>
>
> These files work fine as HTML, and are conforming XML 1.0, but when I try
> to parse them on my laptop using either AElfred or Xerces I get:
>
> java.net.UnknownHostException: www.w3.org
>
> What's wrong? Ah! The parser is trying to resolve the URL for the DTD and
> since I'm offline (connections cost money over here) it can't. So the file
> I have created can only be processed as XML if:
> (a) I am connected online
> (b) the W3C maintain *** for all time *** a means of dereferencing either
> the FPI or the URL
>
> I can't believe this is what the community wants. It fooled me, and I've
> been working with XML for some time.
>
> I still believe that undefined parser behaviour is going to be a major
> deterrent to may people who want to take up XML. I have posted on this
> before. I am going to keep on about it. The most common reaction I seem to
> have so far is "Well that's how XML behaves - it's *your* problem to
decide
> how to process XML". This isn't good enough. In the current case I simply
> want to switch off the parser's attempt to resolve the DTD. I would
> appreciate something like:
>
> "Parser failed to resolve external SYSTEM identifier in DOCTYPE:
> http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd
> To disable DTD look-up use -nosysid option"
>
> So, for about the third time (and it took 3 times to get SAX1.0 off the
> ground, what are we going to do about specifying parser behaviour? I have
> shown in public how the failure to process external entities breaks
systems.
>
> Until we resolve this question (and probably several others), XML 1.0 is
> broken as an interoperable "standard"
>
> P.
>
> [No criticism is aimed at Dave Raggett, who has written a splendid tool,
or
> the W3C who actually have a real DTD mounted at the URL mentioned. Nor to
> the authors of the parsers who have done their best to provide a default
> behaviour, and in the absence of any guidance have required their parsers
> to access an external DTD (very reasonably).
>
>
>
>
>
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