$ http://ontology.ihmc.us/Group.owl $ An ontology created by Andrzej Uszok (auszok@ihmc.us). This class defines groups, whose membership is defined by a commone property (properties) value(s) shared by its members. The membership of the group does not have to be keept centraly and it may be necessary to either examine all the things for membership or broadcast the request for declaring membership to all the things in order to determine the current status of the group. This class defines groups, whose membership is determined by the registratio in the group registry. The registration of the member has to be accepted by the registry. Thus the status of the membership is kept centraly and it is always known. This class defines groups, which can be a subject of policies. It needs a Policy Mediator to decompose such a coars-grain policy into the fine-grain ones and mediate them to the members of the group. This class defines groups of members which are a subject of policy. This class defines groups of actors sharing common goal(s).