Good point. Neither are types of actor though.

fugu13 <notifications@github.com> wrote:

>In xAPI.md:
>
>> -constituent Agents. Inverse functional identifiers used for identified Groups > -SHOULD NOT be used for any Agents. > - > -Systems consuming Statements MUST NOT assume member Agents comprise an exact > -list of agents in an anonymous or identified Group. > - > -__Anonymous Group__ > -<table> > +``` > + > +####4.1.2.2 Group > +#####Description: > + > +A Group... > + > +* is a type of Actor just like an Agent is; 
>
>We intentionally moved away from calling Group a type of Agent (and neither's a type of Actor, which isn't a specified concept), as it was causing confusion. Groups are Groups, Agents are Agents. In many places where one may be used the other may be used, but in some places there are restrictions.
>
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