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Re: Comments on "one vocabulary, two serializations"

From: Maciej Stachowiak <mjs@apple.com>
Date: Sat, 25 Jul 2009 23:37:18 -0600
Cc: Ms2ger <ms2ger@gmail.com>, Karl Dubost <karl+w3c@la-grange.net>, HTML WG <public-html@w3.org>
Message-id: <8C05DAA1-1304-42A4-B81B-D259ECEA85F0@apple.com>
To: Larry Masinter <masinter@adobe.com>

On Jul 25, 2009, at 10:54 PM, Larry Masinter wrote:

>> But perhaps a different fruitful way to think of this is to make it
>> definitional, rather than a matter of conformance requirement.
>
> Yes, that was my point.
>> A resources served as text/html *is* (possibly invalid) HTML,
>> and *is  not* XHTML.
>
> Exactly, at least "on the web". Perhaps the "architecture of the
> web" document doesn't make the relationship between MIME types
> and languages clear enough?

I think making this definitional is different from making it  
implementation advice. (I'm not even sure how this particular issue  
could be recast as "implementation advice"). But making it a  
definition rather than a conformance criterion makes sense to me. In a  
way, it's nonsensical to say that an XHTML document sent as text/html  
is not a conforming XHTML document, because the intent of the spec is  
that there's no such thing as an XHTML document sent as text/html.


>> and not by particular DTD declarations or certain uses of slashes, or
>> whatever other things people may mistakenly think makes a document
>> XHTML.
>
> In lieu of an external indicator (if one isn't available), and
> in some situations where mislabeling has been common, additional
> heuristics are often applied, leading to content type sniffing,
> and poor interoperability (because one language was intended
> but the wrong one implied.)

That has been indeed true in some situations, though I don't believe  
there's ever been an actual client that content sniffs to tell the  
difference between HTML and XHTML, other than validators. Part of the  
intent here is to get validators and content producers aligned with  
the way HTML consumers have been doing things.

Regards,
Maciej
Received on Sunday, 26 July 2009 05:38:53 UTC

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