From: Neil Soiffer <neil.soiffer@gmail.com>

Date: Wed, 21 Apr 2010 13:19:24 -0700

Message-ID: <n2zd98bce171004211319x18969c8bz62ed1a3d05932298@mail.gmail.com>

To: David Carlisle <davidc@nag.co.uk>

Cc: Frédéric WANG <fred.wang@free.fr>, "www-math@w3.org" <www-math@w3.org>

Date: Wed, 21 Apr 2010 13:19:24 -0700

Message-ID: <n2zd98bce171004211319x18969c8bz62ed1a3d05932298@mail.gmail.com>

To: David Carlisle <davidc@nag.co.uk>

Cc: Frédéric WANG <fred.wang@free.fr>, "www-math@w3.org" <www-math@w3.org>

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> > 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. > ________________________________________________________________________ > >Received on Wednesday, 21 April 2010 20:27:54 UTC

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