RE: [EXTERNAL] Re: Minutes: MathML Core meeting July 27, 2020

The fence and separator attributes are useful in Dirac notation. For example, in the expectation value , the vertical bars are separators (not absolute-value fences), while in the bra , the vertical bar is a closing fence. So separator=“true” conveys the former and fence=”true” conveys the latter. Both LaTeX and OfficeMath have these distinctions, so it’s important that they don’t get lost in Presentation MathML.

At some point, I’d like to offer the richness of OfficeMath on the web and MathML is the obvious storage format for that. So I really don’t want to deprecate MathML to the point where we can’t speak and display it correctly. An even more ambitious goal is to be able to compute with Presentation MathML, a goal that wants more attributes rather than less. Browsers need to be able to speak math correctly and so even if the display of a vertical bar is the same for absolute value and the expectation value above, it isn’t spoken the same way. So we need the distinction and should fix the description in the MathML spec.
Thanks,
Murray

From: David Carlisle<mailto:davidc@nag.co.uk>
Sent: Monday, July 27, 2020 3:58 PM
To: public-mathml4@w3.org<mailto:public-mathml4@w3.org>
Subject: [EXTERNAL] Re: Minutes: MathML Core meeting July 27, 2020




on fence= and separator=  the mathml3 spec says



This attribute generally has no direct effect on the visual rendering, but may be useful in specific cases, such as non-visual renderers.



I think the proposed semantic attributions would be giving much better non-visual clues here and suggest we just drop both of these from full

(we could potentially keep them in the schema as legacy ignored attributes)



David


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