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[Bug 11909] The principles of Polyglot Markup - validity? well-formed? DOM-equality?

From: <bugzilla@jessica.w3.org>
Date: Fri, 28 Jan 2011 16:05:31 +0000
To: public-html-bugzilla@w3.org
Message-Id: <E1PiqpH-0000nE-Qh@jessica.w3.org>

--- Comment #3 from David Carlisle <davidc@nag.co.uk> 2011-01-28 16:05:31 UTC ---
(In reply to comment #2)
>(What I must admit I find a bit strange is that
> the mere presence of a DTD, regardless of what the DTD says, would cause <p
> id="666"/> to be invalid ...)

that would be strange, but is not the case, there are no special rules for
attributes of name id in XML. If an attribute is declared of type ID (whatever
its name) then some additional validity rules apply.

> Thus Polyglot Markup needs only to say that, as long as (or because/when) there
> is no DTD, then XML-validity is not an issue. But I would not mind if it also
> said what to remember when/if there *is* a DTD. After all, the goal is to have
> an equal experience also in that circumstance.

> To say that Polyglot Markup describes a DOM-equal subset of conforming HTML and
> well-formed XML, sounds like a good description of the principle(s). From that
> definition it should be easy to understand what "HTML-compatible XHTML" means.
> May be the spec should say that when it says "HTML-compatible" then it means
> "DOM-equal".
> The spec could then explain that the rules for conforming HTML are found in
> HTML5. And also say that the DOM to which polyglot markup needs to adapt, is
> also described in HTML5. But that the rules for well-formed XML are found in
> XML. The spec could then, as you say, go on to discuss the consequenses of
> these rules and principles.
> I hope that this can be dealt with more systematically in the spec.

agreed, there have been a succession of bug reports from me on various version
sasking that this be clarified, it's better than it was but still not crystal
clear I agree.

If it was made clear at the start that the document was well formed xml and
conforming html, the additional rules were to get compatible parse trees then
rules such as

Polyglot markup surrounds all attribute values with quotation marks. Polyglot
markup surrounds attribute values by either single quotation marks or by double
quotation marks. 

in section 7 could be removed, as this is implied by (but only a small part of)
being well formed.

> Thus, the spec should not mention <xmp> and <plaintext>. Or, if it mentions
> them, then it should make clear that they are invalid in HTML5 and that they
> are impossible to include in a DOM equal polyglot. (Well, xmp is possible, as
> long as one ignores the purpose of it in the first place.)

agreed these should go as if they are there the document isn't conforming


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Received on Friday, 28 January 2011 16:05:33 UTC

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