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Re: XML incremental rendering, was Re: Standards mode and Quirks mode (was Re: [CSS21] Test Suite)

From: Robin Berjon <robin.berjon@expway.fr>
Date: Tue, 27 Jul 2004 20:24:10 +0200
Message-ID: <41069DCA.1040102@expway.fr>
To: Andrew Fedoniouk <news@terrainformatica.com>
Cc: W3C Style List <www-style@w3.org>

Andrew Fedoniouk wrote:
> From: "Robin Berjon":
>>  .... * therefore, there is not a single argument against incremental
>>    rendering of XML documents...
> 
> Just only one: document cannot be rendered (drawn) until XML parser is not
> sure that the xml is well formed.

Can you point at a spec that says that *anywhere*, even for fringe 
circumstances? If not, then you can have your opinion and I respect it, 
but you're not describing the behaviour of any conformant UA, and 
therefore I don't see what this discussion is about.

> Illustration:
> 
> Let's say we have a printer (as an output media) and  following xhtml:
> 
> <html>
> <body>
> <p>paragraph</p>
> </html>
> 
> When UA (optimistic one) have got the </p> it starts rendering it - draws
> 'paragraph' on
> physical paper page. Then after reading </html> it discovers that document
> is not well formed so it is not a xthml at all.
> So UA should return paper page back to the printer tray and clear it
> somehow? Not bad, eh?!

No one ever said that. The document is in error and that should have an 
effect described by the relevant specification. One way in which it 
could be done would be by printing "Non-conformant document" in big type 
as soon as the error is encountered. If you feel that the relevant 
specifications aren't clear enough with respect to signaling error 
conditions on print media, then please take your comments to the 
appropriate WGs.

> Even in case of screen media: document appears on screen and then it will
> dissolve somehow?

Have you never seen something disappear from a computer screen? Have you 
never gotten an error message from your computer? If not, you're one 
lucky person.

> How it supposed to look like actually?

Specs could define what it is supposed to look like. Or they could be 
flexible and require that a) no further processing be performed and b) 
the user be informed of the error.

> If UA will left partial content on
> the screen then it means that UA uses input language other then XML.

You can repeat that as many times as you like, it won't make it true.

According to your description, if the UA displays an error message 
(partial content) then it's not XML-conformant. Just because it *reacts* 
to something that is no an XML document doesn't mean that it does not 
conform to XML -- quite the contrary in fact.

> For any given  XML you cannot render/draw (change state of the view)
> partialy.
> Or forget about XML.

Prove it.

-- 
Robin Berjon
Received on Tuesday, 27 July 2004 14:25:15 GMT

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