From: Frédéric WANG <fred.wang@free.fr>

Date: Wed, 21 Apr 2010 23:00:31 +0200

Message-ID: <4BCF676F.2020300@free.fr>

To: neils@dessci.com

CC: Neil Soiffer <neil.soiffer@gmail.com>, David Carlisle <davidc@nag.co.uk>, "www-math@w3.org" <www-math@w3.org>

Date: Wed, 21 Apr 2010 23:00:31 +0200

Message-ID: <4BCF676F.2020300@free.fr>

To: neils@dessci.com

CC: Neil Soiffer <neil.soiffer@gmail.com>, David Carlisle <davidc@nag.co.uk>, "www-math@w3.org" <www-math@w3.org>

OK. FYI, I've recently worked on these attributes and had the same interpretation as you: allowed on <math/> but not on <semantics/>. However, there are already existing regression tests in Mozilla that want these attributes not to have effect on <math/>, so I wanted to check that my interpretation was correct. Thanks for your answers. PS: Strictly speaking, <semantics/> is not implemented in Firefox yet. The only thing we do is using a CSS stylesheet to display the first child and hide the other children... On 21/04/2010 22:19, Neil Soiffer wrote: > I completely concur with David. > > The first version of Firefox's handling of MathML didn't handle > semantics, and this was a big problem for a lot of MathML that was > generated. Other implementations also skipped it because <semantics> > was listed in chapter 4 -- content MathML. We have tried to make it > much clearer that the semantics elements should be considered part of > both presentation and content MathML, and that a renderer that deals > with only one side of MathML should handle semantics to at least the > extent it makes sense for that side of MathML. > > To be a bit perverse, if <semantics> accepted mathcolor/background, > then someone could complain that it shouldn't because it is part of > content MathML, and the section you quoted doesn't say it should be > part of content MathML. > > Neil > > > 2010/4/21 David Carlisle <davidc@nag.co.uk <mailto:davidc@nag.co.uk>> > > On 21/04/2010 11:27, Frédéric WANG wrote: > > Thanks for the comments, the following is a personal reply, we'll get > group agreement before actually making any changes. > > > Hello, > > The spec says that mathcolor/mathbackground are accepted on > all MathML > presentation elements: > http://www.w3.org/TR/MathML3/chapter2.html#interf.toplevel.atts > > <math/> and <semantics/> are not listed among MathML presentation > elements, so I think mathcolor/mathbackground should not be > allowed on > them, and this is confirmed by the RelaxNG schema. > http://www.w3.org/TR/MathML3/chapter3.html#presm.summary > > However, the two sentences below could be interpreted as > saying that > <math/> accepts mathcolor/mathbackground attributes: > > "The math element accepts any of the attributes that can be set on > Section 3.3.4 Style Change <mstyle>" > "mstyle elements accept the attributes listed in Section 3.1.10 > Mathematics style attributes common to presentation elements. " > > > I think this is fairly explicit that math should really work (as > far as its children are concerned) like an mstyle. If the schema > doesn't have that attribute that's an error, sorry about that. > > > and this one for <semantics/>: > > "semantics should be considered part of both presentation > MathML and > content MathML" > > > That's more of a general hint that for example "just do > presentation mathml" systems just should at least accept > semantics to the point of rendering a presentation attribution or > a first child if that's presentation. (and not raise an error on > semantics as an unknown element) I don't think that this informal > note should have any effect on the schema. > > David > ______________________________________________________________ > > > ________________________________________________________________________ > The Numerical Algorithms Group Ltd is a company registered in England > and Wales with company number 1249803. The registered office is: > Wilkinson House, Jordan Hill Road, Oxford OX2 8DR, United Kingdom. > > This e-mail has been scanned for all viruses by Star. The service is > powered by MessageLabs. > ________________________________________________________________________ > > -- Frédéric Wang. www.maths-informatique-jeux.com <http://www.maths-informatique-jeux.com> www.maths-informatique-jeux.com/international <http://www.maths-informatique-jeux.com/international>Received on Wednesday, 21 April 2010 21:11:01 UTC

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