W3C home > Mailing lists > Public > site-comments@w3.org > November 2009

Re: MIME specification clarification

From: Ian Jacobs <ij@w3.org>
Date: Tue, 10 Nov 2009 08:36:50 -0600
To: Sue Hart <honeydew_a@yahoo.com.au>
Message-Id: <415C3225-EB9F-4CC2-9BD7-7CFEA7BA3AED@w3.org>
Cc: site-comments@w3.org

On 10 Nov 2009, at 2:05 AM, Sue Hart wrote:

> To whom it may concern
> I have been teaching IT students learning Webpage construction to  
> use templates that follow the structure shown on the W3C's own web  
> pages. Namely:
> <?xml version="1.0" encoding="utf-8"?>
> http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
> <head>
> <title>World Wide Web Consortium (W3C)</title>
> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
> We have in our labs until very recently been using IE 6 but have now  
> upgraded to IE 7.
> I feel I should now be altering the MIME type to be 'application/ 
> xhtml+xml' but I note that W3C has not done this on their pages. Is  
> this be cause of backward compatibility issues with earlier browsers?

Yes, there are some compatibility issues.

> I have gone and looked at the http://www.w3.org/TR/xhtml-media-types/#compatGuidelines 
>   "Compatibility Guidelines" for people wanting to serve XHTML as  
> text/html. In here it says you :
> "DO NOT include XML processing instructions NOR the XML declaration."
> However, as copied above, W3C actually have their web pages starting  
> with the XML declaration and serving as text/html?

That seems to be the case, indeed. I've not heard of any problems in  
using it.

> I am asking because I use what the coding used on W3C pages is as  
> guidance for my teaching. I find many of the recommendations very  
> difficult to understand so I am wondering if I have misunderstood  
> something here?
> Given I am teaching TAFE (Technical and Further Ed) students units  
> that ask them to develop pages to W3C standards, in today's world  
> what do you think the best standard is to teach? I have been using  
> XHTML 1.0 Strict, and getting students to make and work off a  
> template that starts with the (?xml dec, then a < ! - - comment  
> declaring their authorship, then the (!DOCTYPE, then the (html root  
> as shown above, then the (head, the (title and the (meta http-equiv  
> as specified on your pages.
> I hope someone is able to help me with a clarification on this.

Let me ask around and get back to you.

  _ Ian

> Thankyou in anticipation
> Regards
> Sue Dowson
> P.S. Thanks to every one of you folk that work on the W3C  
> guidelines. I hate to think where we would be without them.
> Win 1 of 4 Sony home entertainment packs thanks to Yahoo!7. Enter now.

Ian Jacobs (ij@w3.org)    http://www.w3.org/People/Jacobs/
Tel:                                      +1 718 260 9447
Received on Tuesday, 10 November 2009 14:36:53 UTC

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