ManagementDomain represents a special grouping of ManagedEntities that has two important properties. First, it is used to partition managed objects into a meaningful logical grouping. One important use of such a grouping is to provide a means to define which EMS (as well as which NMS) manages, monitors, etc. which set of devices. Another important use of such a grouping is to provide a means to show how management functions are distributed and scaled.<br/>Second, this grouping defines a common administrative domain that is used to administer the managed objects that it contains. This implies that all of the managed objects contained in this ManagementDomain are administered similarly – either by the same user, group of users or policy.<br/>A ManagementDomain is the superclass of several important entities in the SID. One of the most important of these is the PolicyDomain class. A PolicyDomain is a collection of entities and services that are administered in a coordinated fashion using a set of policies. The policies are used to control the set of services and entities according to a common methodology, such as a finite state machine. This is defined in Policy addendum.<br/>The ManagementDomain class also enables relationships to be defined that convey various semantics, such as containment, scoping, administration, and more generic management functions.<br/>