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   Re: Megginson and XMLNews

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  • From: David Brownell <db@eng.sun.com>
  • To: "'xml-dev@ic.ac.uk'" <xml-dev@ic.ac.uk>
  • Date: Thu, 08 Apr 1999 11:45:29 -0700

>  > If you are trying to see DTD in IE5 browser, it reports:
>  > <IE5 Error>
>  > The 'version' attribute is required at this location. Line 1, Position 7
>  > <?xml encoding="UTF-8"?>
>  > </IE5 Error>
> This is an interesting problem -- MSIE must consider the DTD files to
> be of type text/xml, but they are not XML documents.  If they had an
> XML declaration at the top (rather than just an encoding declaration),
> they would be invalid as part of a complete document.

Actually, this looks like another IE5 XML bug ... 

- 4.3.2 of the XML spec says an external PE (like a DTD fragment!)
  may have an optional "Text Declaration".
- 4.3.1 says that the text declaration may have (or omit) a version
- 2.8 explains the rule for the XML declaration

It's always safe to have an external entity with this at the front:

	<?xml version='1.0' encoding='whatever'?>

The "version" may be dropped if it _is NOT_ the document entity.
The "encoding" may be dropped if it _is_ the document entity.
Only the document entity may have a "standalone" attribute.

- Dave

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