All person and group nodes are in one or more zones. You can use zones for any
      partitioning of authorities. For example, SkyVault synchronization uses zones to record from
      which LDAP server users and groups have been synchronized. Zones are used to hide some groups
      that provide Role Based Access Control (RBAC) role-like functionality from the administration
      pages of SkyVault Share. Examples of hidden groups are the roles used in SkyVault Share and
      Records Management (RM). Only users and groups in the default zone are shown for normal group
      and user selection on the group administration pages. Zones cannot be managed from the
      administration pages of SkyVault Share. 
    Zones are intended to have a tree structure defined by naming convention. Zones are grouped into two areas: Application-related zones and authentication-related zones.
Within a zone, a group is considered to be a root group if it is not contained by another group in the same zone.
SkyVault uses a model for persisting people, groups, and zones. A Person node represents each person, and an AuthorityContainer represents groups, which can be used for other authority groupings such as roles. AuthorityContainer and Person are sub-classes of Authority and as such can be in any number of Zones.
