[Ops] MOCs in ADQL

[Markus Demleitner]

Hi James,

The poster from the Tucson ADASS about MOCs in ADQL is here:
https://adass2023.lpl.arizona.edu/events/poster-p102

It would really be great if there was a second implementation of
that...

And one last time: I'd really like to help producing Registry records
out of your table metadata...

Thanks,

         Markus