6. A method of operating an XML Document Management Server, the method comprising: managing a plurality of Group Documents, each Group Document: defining a group; defining related groups to the group; identifying members of the group; and including policies that are applicable to the group, wherein policies that are applicable to the group is determined by combining policies of related groups identified within the Group Document with a users' group of the Group Document, wherein the combining policies with the policies of the identified related groups as specified by the Group Document comprises any of: if a policy of the user's group contradicts a corresponding policy of a superior one of the identified related groups, overriding the policy of the user's group with the policy of the superior related group; and if a policy included in the user's group is narrower than a corresponding policy of a one of the identified related groups, overriding the policy of the superior related group with the policy of the user's group; maintaining dynamic data relating to group members in the Group Documents; receiving a request for policies that are applicable to an identified group; retrieving policies and dynamic data from the Group Document of the identified group; responding to the request with the retrieved policies and dynamic data; wherein the policies included in Group Documents comprise a maximum number of session in which members of the group are allowed to participate simultaneously; wherein the dynamic data comprises the number of sessions in which members of the group are participating.
6. A method of operating an XML Document Management Server, the method comprising: managing a plurality of Group Documents, each Group Document: defining a group; defining related groups to the group; identifying members of the group; and including policies that are applicable to the group, wherein policies that are applicable to the group is determined by combining policies of related groups identified within the Group Document with a users' group of the Group Document, wherein the combining policies with the policies of the identified related groups as specified by the Group Document comprises any of: if a policy of the user's group contradicts a corresponding policy of a superior one of the identified related groups, overriding the policy of the user's group with the policy of the superior related group; and if a policy included in the user's group is narrower than a corresponding policy of a one of the identified related groups, overriding the policy of the superior related group with the policy of the user's group; maintaining dynamic data relating to group members in the Group Documents; receiving a request for policies that are applicable to an identified group; retrieving policies and dynamic data from the Group Document of the identified group; responding to the request with the retrieved policies and dynamic data; wherein the policies included in Group Documents comprise a maximum number of session in which members of the group are allowed to participate simultaneously; wherein the dynamic data comprises the number of sessions in which members of the group are participating. 7. The method of claim 6 , wherein the maintaining dynamic data relating to group members in the Group Documents comprises updating, when a status of a group member changes, the dynamic data in the Group Document.