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What should a microformats validator do?
The existing microformats validators are quite good at some things, yet could certainly be better. Let's collect some brainstorms for improvement beyond just, add microformats2 support to existing validators.
Validators could check the values of "dt-*" properties for date, time, timezone and duration errors.
dt-end after dt-start
hCalendar 1.0 validators should check to make sure that any dt-end property value is temporally after the dt-start value for the event.
longitude and latitude could be checked to see if they were within the right number range i.e. < 180/90 and > -180/-90.