Add rules to map from non-combining to combining accents

[fred-wang]

Original thread: https://lists.w3.org/Archives/Public/www-math/2018Mar/0001.html
Also from the MathML in HTML5 note tracker: https://gitlab.com/mathml/MathMLinHTML5/issues/33

I think such a rule should be in MathML Core.

[fred-wang]

David did https://mathml-refresh.github.io/mathml-core/#comb-equiv

[fred-wang]

However, I think the MathML Core text still has to be adjusted and refer to that table.

[davidcarlisle]

@fred-wang yes in fact I had never really extracted or looked at that data from unicode.xml since adding it during the email discussion, so I just added more or less raw tables into that appendix. To be decided if it needs an appendix or should just be a table in the main body, also I am not sure we need to display the "reverse direction" table. But at least the raw data is now there.

[fred-wang]

@davidcarlisle where is the latest version of unicode.xml ; http://www.w3.org/2003/entities/2007xml/unicode.xml seems not up-to-date?

[fred-wang]

https://github.com/mathml-refresh/xml-entities I guess

[davidcarlisle]

https://github.com/mathml-refresh/xml-entities I guess

which is the same as the one in the W3C github at https://github.com/w3c/xml-entities/ The one in W3C TR space is older

…

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[fred-wang]

I think it would be good to have one "official" version to use/edit.

[davidcarlisle]

Sure but it is same as mathml-full spec (and potentially core as well) we are using the mathml-refresh github as that gives full admin control and we can generate new repositories and give write access as required, but if we move to a REC track process (I think) we will need to move to a W3C organisation github, however I am assuming a workflow that doesn't edit on on the w3c repository we just periodically merge in changes from mathml-refresh

So historically all edits to unicode.xml for several years have been at https://github.com/w3c/xml-entities/ but I think the current policy should be that edits happen in mathml-refresh (https://github.com/mathml-refresh/xml-entities ) and are then merged across to https://github.com/w3c/xml-entities/

[fred-wang]

For MathML Core, I think we only want non-combining => combining mapping.
And actually an ordered list of combining characters so that browsers can try them in a determined order.
I'll try to update the spec for that.

[fred-wang]

I had set https://mathml-refresh.github.io/mathml-core/#combining-character-equivalences to "non-normative" ; we should defer the details for accents to a next version of core.