[whatwg] HTML5 competing with XML

Ian Hickson ian at hixie.ch
Mon Jul 6 15:36:23 PDT 2009

On Mon, 6 Jul 2009, Anton Frattaroli wrote:
> Allowing XML namespaces to be "inserted" into HTML5 is a neat feature,
> but challenges its definition as a subset of XML.

As others have noted, HTML5 in text/html isn't XML. If you want to use 
HTML5 with XML you have to use XHTML5, which does require you to declare 
your namespaces, as per the XML specification.

> Mixing markup languages also makes the DOCTYPE declaration pretty much 
> null and void.  What's the point of a DTD if you're going to add in 
> other DTDs?

We don't have DTDs in HTML5.

> This is really challenging the whole direction the w3c has pointed out 
> for SGML.

HTML5 doesn't use SGML at all.

Ian Hickson               U+1047E                )\._.,--....,'``.    fL
http://ln.hixie.ch/       U+263A                /,   _.. \   _\  ;`._ ,.
Things that are impossible just take longer.   `._.-(,_..'--(,_..'`-.;.'

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