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Implementation of semantics

From: Frédéric WANG <fred.wang@free.fr>
Date: Mon, 29 Oct 2012 21:23:08 +0100
Message-ID: <508EE5AC.2070505@free.fr>
To: "www-math@w3.org" <www-math@w3.org>
Hi,

I have some questions about the correct implementation of semantics, 
discussed on the Webkit bug tracker:

https://bugs.webkit.org/show_bug.cgi?id=100626

So the correct behavior is basically to use the first child as the 
default rendering and find possible alternate renderings among the 
annotation children. Some questions:

1) Does the following implementation make sense for a browser without 
Content MathML support:

- Test if the first child is a presentation MathML element and if so, 
display it.
- Otherwise, read the list of other children in that order and display 
the first <annotation-xml> with a known encoding ; or a plain text 
<annotation> if one is found.

2) I think the first child can only be presentation / content MathML. 
But does that means that an <annotation> or an <annotation-xml> (which 
are MathML elements) can be used as the first child (to include SVG or 
HTML descendants for example)?

3) What are the official encoding values other than MIME content-type? 
The REC mentions "Content-MathML", "Presentation-MathML" for backward 
compatibility. The W3C note 
http://www.w3.org/Math/Documents/Notes/graphics.xml#svg-in-mathml-guidelines 
also contains the "SVG1.1" value, but is it official?

4) The spec says that <semantics> is an embellished operator if the 
first child is one. But should we actually consider the visible child  
(as we do for maction)?

-- 
Frédéric Wang
maths-informatique-jeux.com/blog/frederic
Received on Monday, 29 October 2012 20:21:26 GMT

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