adlnet/xAPI-Spec — pull request #147 by bscSCORM (2013-04-03 14:17:33+00:00)
Title: Moved inverse functional identifiers into their own sub-section

This change started as an attempt to clarify that actors do NOT require inverse functional identifiers, rather they require a valid agent or group -- which in turn require inverse functional identifiers except for anonymous groups. In order to help clarify that I gave inverse functional identifiers their own sub-section, since talking about IFI's being required in the actor section makes it sound like they're required for all actors.