CoAP group communication

Hi,

I am constructing a WoT TD file for a "Thing" that includes an action that can be invoked using CoAP group communication. What would be the best way to indicate in a "form" that an action can be invoked using group communication? I would imagine something like "subprotocol":"cov:group"

Best,
Nikos

--
Nikos Fotiou - http://pages.cs.aueb.gr/~fotiou
Researcher - Mobile Multimedia Laboratory
Athens University of Economics and Business
https://mm.aueb.gr