Re: data-* attributes

Thanks, David.

> In a pure XML context, attributes in (any) namespace would be the way:

Right. As I wrote in my original posting, the main motivation was doing
something without namespaces.

Peter.

On Mon, Nov 3, 2014 at 3:00 PM, David Carlisle <davidc@nag.co.uk> wrote:

> On 03/11/2014 13:47, Peter Krautzberger wrote:
>
>> Thanks for your comments, David.
>>
>>  > One reason [...]
>>
>>> isthat HTML moved away from grammar based syntax
>>> (data-* being a good example of something that can't even be
>>>
>> approximated in any of
>>
>>> dtd/RelaxNG or XSD schema).
>>>
>>
>> Right. Still, I'd argue that it is a significant use case. Perhaps there
>> could be note suggesting a best practice for providing information in
>> XML that would be represented as data-* in HTML.
>>
>
> In a pure XML context, attributes in (any) namespace would be the way:
> data- is in some ways an html response to address that without the
> complication of namespaces. MathML even back as far as MathML1 has always
> allowed any attributes in other namespaces (in the prose and as far as
> possible in the grammar) The schemas allow it, DTD has a parameter entity
> that makes it easy to extend an initially empty set of
> namespaced attributes, which is best you can do in DTD.
>
> Trouble is (as you see already in aria: v aria- attributes) documents
> don't always live in purely xml or purely html contexts and "best practice"
> for switching between the two isn't always clear yet.
>
>
>>  MathJax could easily ignore  [...]
>>>
>>
>> FWIW, MathJax wasn't the motivation for my question; this came out of
>> questions regarding JATS. In practice, data-* works just fine; it's just
>> not formally valid.
>>
>
> <mi jats:foo="bar"> is valid to the MathML3 schema (as long as jats:
> namespace is declared somewhere) it's just that you don't want to let
> attributes with colons in their name anywhere near an HTML parser, the
> behaviour is specified but not particularly useful. So by spec the
> implied suggestion is to have
> <mi jats:foo="bar"> in XML and <mi data-jats-foo="bar"> in HTML
> But just allowing the latter in XML would probably make everyone's life
> easier.
>
>
>
>  Peter.
>>
>>  David
>
>