Re: [xml-dev] Namespace prefix declarations vs DTDs

[Elliotte Harold <elharo@ibiblio.org>]

On Fri, May 15, 2009 at 6:14 PM, Bjoern Hoehrmann <derhoermi@gmx.net> wrote:
> Hi,
>
>  I would like the XML Conformance Test Suite to cover test cases such
> as these two documents.
>
>  <!DOCTYPE x [ <!ELEMENT x EMPTY> ]>
>  <x xmlns:xml='http://www.w3.org/XML/1998/namespace'/>
>
>  <!DOCTYPE x [ <!ELEMENT x EMPTY> ]>
>  <x xmlns:foo='http://example.org'/>
>
> The reason for inclusion is that there is confusion as to whether the
> documents are valid. My own reading is that both documents are not
> valid. The libxml2 tool xmllint regards the first as valid but the
> second as invalid. The W3C Markup Validator accepts both as valid.
>

 The W3C Markup Validator is wrong about both of them. xmllint is
wrong about the first. Both of these are clearly invalid. Namespace
declaration attributes are in no way special with respect to DTD
validation. They must be declared in order for the document to be
valid.

-- 
Elliotte Rusty Harold
elharo@ibiblio.org