W3C home > Mailing lists > Public > www-svg@w3.org > December 2007

Re: is this switch valid?

From: ~:'' ありがとうございました。 <j.chetwynd@btinternet.com>
Date: Mon, 10 Dec 2007 10:53:14 +0000
Message-Id: <519CF147-DE8A-499E-BCCA-1C0A16B4F67D@btinternet.com>
Cc: www-svg List <www-svg@w3.org>
To: Erik Dahlström <ed@opera.com>


thanks for that,
I have filed a bug:

but can you advise me whether or when Opera will support the audio  
with CSS as used in http://www.peepo.co.uk


Jonathan Chetwynd
Accessibility Consultant on Media Literacy and the Internet

On 10 Dec 2007, at 10:18, Erik Dahlström wrote:

On Sun, 09 Dec 2007 09:57:12 +0100, Jukka K. Korpela  
<jkorpela@cs.tut.fi> wrote:

> "~:'' ありがとうございました。" wrote:
>> the validator is barphing* on the attached SVG sample**.
>> some code has been removed to help identify the issue
> As usual in validation issues, the URL of the problem document should
> have been included.
>> * Line 26, Column 3: end tag for "switch" omitted, but OMITTAG NO was
>> specified.
> That's not the _first_ error message you get, is it? When I test your
> fragment (using the W3C validator's nice feature of specifying DOCTYPE
> interactively, and adding <svg> tags), I first get
> document type does not allow element "foreignObject" here; assuming
> missing "switch" start-tag.
> After this, it's no big surprise to get a message about missing end  
> tag
> as well.
> I don't really know SVG, but neither need I know it to see that the
> markup
> <g  requiredExtensions="http://example.com/SVGExtensions/ 
> EmbeddedXHTML">
>      <foreignObject width="100" height="50">
>      </foreignObject>
> </g>
> is indeed invalid, since by the DTD, a <g> element may not have a
> <foreignObject> as its subelement ("child") - unless you're using DTD
> extensions. The <foreignObject> element is allowed as a subelement  
> of a
> <switch> element only.

That sounds like a bug in the DTD for 1.1, and that's not how Opera  
or Firefox handles it.
In SVGT12 'foreignObject' can be a child of any container element,  
which is much more useful and I believe that is what Opera and  
Firefox allows.

Also note that it's fine to have a custom extension ("http:// 
example.com/SVGExtensions/EmbeddedXHTML"), but if viewers properly  
support the conditional processing in SVG they must ignore an element  
and its children if it doesn't understand the requiredExtension  
value. Not sure if there is a central registry for requiredExtensions  
anywhere, but Opera currently doesn't claim to support any particular  
extensions which means that the 'g' element (and its children) in the  
example above will not be displayed.


Erik Dahlstrom, Core Technology Developer, Opera Software
Received on Monday, 10 December 2007 10:53:34 UTC

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