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xml-stylesheet Re: Agenda for XML Core WG telcon of 2009 June 17

From: Simon Pieters <simonp@opera.com>
Date: Wed, 17 Jun 2009 18:35:14 +0200
To: "Grosso, Paul" <pgrosso@ptc.com>, public-xml-core-wg@w3.org
Message-ID: <op.uvogc0a5idj3kv@simon-pieterss-macbook.local>
On Mon, 15 Jun 2009 16:12:02 +0200, Grosso, Paul <pgrosso@ptc.com> wrote:

> 11.  Associating Stylesheets.
>

There was some discussion about what to do with the values of media="" and  
href="".


HTML4 says about media="":  
http://www.w3.org/TR/html401/present/styles.html#adef-media

which says that the default value is "screen", which is not correct; the  
default value should be "all".

http://www.w3.org/TR/html401/types.html#type-media-descriptors also gives  
parsing rules for the media value, which are different than the parsing  
rules given in the Media Queries spec.  
http://www.w3.org/TR/css3-mediaqueries/



HTML4 says about href="":  
http://www.w3.org/TR/html401/struct/links.html#adef-href

i.e. that it's value is a URI (but it probably meant URI *reference*).

HTML4 also has an appendix about what to do with non-ASCII:  
http://www.w3.org/TR/html401/appendix/notes.html#non-ascii-chars

This advice is different from what is specified in DanC's draft (see  
below).



HTML5 basically says that href="" must be a valid IRI reference.

"The destination of the link(s) is given by the href attribute, which must  
be present and must contain a valid URL."

where "valid URL" points to

http://www.whatwg.org/specs/web-apps/current-work/multipage/infrastructure.html#valid-url

which references the Web Addresses spec:

http://www.w3.org/html/wg/href/draft#valid-url

...which, for the purpose of xml-stylesheet, is the same as a valid IRI  
reference (since the URL encoding weirdness is only relevant for HTML and  
not for XMLHttpRequest or CSS or xml-stylesheet).

We could say in xml-stylesheet that the value must be a valid IRI  
reference.

As for interpreting the value, we should say to resolve the IRI reference  
against the document's address. If we do so by referencing  
http://www.w3.org/html/wg/href/draft#resolve-a-url we get HTML-compatible  
handling of invalid values for free. (Opera already uses the same rules  
for HTML href="" and xml-stylesheet href="".)

-- 
Simon Pieters
Opera Software
Received on Wednesday, 17 June 2009 16:35:56 GMT

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