W3C home > Mailing lists > Public > www-validator@w3.org > June 2007

DOCTYPE vs. doctype

From: Jukka K. Korpela <jkorpela@cs.tut.fi>
Date: Mon, 11 Jun 2007 10:26:29 +0300 (EEST)
To: Sined <nightsbird@gmail.com>
cc: www-validator@w3.org
Message-ID: <Pine.SOC.4.64.0706111022520.27830@hopeatilhi.cs.tut.fi>

On Sun, 10 Jun 2007, Sined wrote:

> The doctype in my (X)HTML documents is written in lowercase (but not the 
> formal public identifier) :

That's a syntax error, since by XML rules, the string DOCTYPE must appear 
in uppercase.

> At <http://lists.w3.org/Archives/Public/www-validator/2002Nov/0099.html>, 
> that?s written that we get that error because of the SGML rules.

I think you somewhat misunderstood the discussion - which was rather 
confusing. But the situation is rather simple: in SGML, the string 
DOCTYPE is case insensitive, in XML, it is case sensitive.

> Now the question is : Must I write the doctype in uppercase or not?

If you use XHTML, you must.

Jukka "Yucca" Korpela, http://www.cs.tut.fi/~jkorpela/
Received on Monday, 11 June 2007 07:26:42 UTC

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