March 12 MathML Refresh meeting notes

Thanks to David Carlisle for the following notes. The meeting was recorded
and can be found at:
https://benetech.zoom.us/recording/share/gTFKtuxJJAdlsHE6fYkjQa2AO1FQqe6rC5ccHiHNZOqwIumekTziMw


Three action items came out of the meeting:
*Action*: Murray make initial draft summary
*Action*: Neil/David check W3C spec REC track requirements
*Action*: Adam to update his proposal based on feedback (#68)


Four topics were on the agenda, GH issues TPAC, #47, #68, #64

TPAC in Japan -- No one planning to go, so no face-to-face there.

#47 Which specifications to produce.
Core spec
Issue what other spaces, do we separate content
some discussion in the issue.

Need two implementations for any spec, so more that's in a spec, the harder
it is to get implementation

Charles: need buy-in from browser vendors

David: that applies directly to core,
non core should mostly be covered by polyfills.

Patrick: core could be first with mathml4 coming later, would be against
splitting too much.

Neil: we need at least a draft of the main spec when core moves forward

David: there are already rough drafts of full and core.

Adam: could have a separate spec for meta data.

All: rough consensus to keep full spec including presentation and
content. We will come back to issue of further specs later.

David: we should re-publish entities spec (Unicode 12 just came out)


#68 extended Meta data

Adam: summarized the 4 points from the issue.

Neil: commented meta data idea similar to existing parallel markup with
parallel ids.

Neil: i18n annotations would be useful we should allow lang on annotations

Murray: better to specify the feature not the language, eg specify tan
v tg, rather than specifying a language.

Neil: we should build on existing html/css solutions eg for decimal
comma. It is not clear if css will have a solution for this; can be
done in JS. Quick search shows someone had a CSS proposal that went nowhere.

Murray: Windows supports digit substitution ascii digits changed (for
display) to specified digit format.

Neil/Murray: need to enumerate the change points where different
language or stylistic conventions affect display.

*Action*: Murray make initial draft summary

Adam: accessibility annotations

Neil: eg could annotate with recorded human voice as alternative to
generated speech



*Action*: Neil/David check W3C spec REC track requirements

media queries

allows sorting of annotation types or two images for different
resolutions

David: image media queries should be compatible with html <img> best
practice.

remote content

Adam: allows longer php generated mathml files to be served and
organised separately.
similar to xml include

David; commented that svg may be inlined or referenced via <img src=...>

*Action*: Adam to update his proposal based on feedback (#68)

#64 semantics annotations in presentation MathmL

Neil: Aria WG suggested things added to their issue tracker, but we
need to clarify our requests first.

examples to distinguish superscripts a power, index, etc, ...

Came up with 15-20 fraction-like notations using mfrac but not really
fractions.

wikidata.org can add definitions
OpenMath another alternative but doesn't have these symbols, and
adding new symbols is harder,

Neil: spec would specify role attribute and a non REC Note would give
examples for specific symbols.

General agreement that adding a role-like attr is a good idea. No agreement
yet on what they should be/where those should be specified/what they
reference.