Reminder: MathML Full meeting on Thursday

 We meet at our standard time on Thursday, 10am Pacific, 1pm Eastern,7pm
Central European Time.

The meeting details were sent to the W3C members-only "member-math" mailing
list <https://lists.w3.org/Archives/Member/member-math/2021May/0000.html>
for the group. The regulars for this group should have the meeting details
in their calendars.

Agenda
1. Announcements/Updates/Progress reports
   a) reminder about videos
   b) presentation chapter update (Neil)
   c) content chapter update (Sam?)
   d) accessibility appendix (Steve?)
   e) other updates?

2. What "reserved" attributes should be added to core/full/schema?

3. Resolve/close some intent issues
a) function call head PR <https://github.com/w3c/mathml/pull/394>
c) intent and prefix/infix/postfix notations
<https://github.com/w3c/mathml/issues/376>
d) n-ary Intent discussion <https://github.com/w3c/mathml/issues/253>
<https://github.com/w3c/mathml/issues/253>
e) other issues?