Scope Represents a single scope.
 ScopeAware Interface to be implemented by scope extensions that need access to the Scope instance they are associated with.
 ScopeExtensionRegistry A registry for scope-wide extensions.
 ScopeExtensions Registry for custom extensions added to a scope.
 ScopeInfo Holds the definition and state (like all registered message receivers) for a single scope.
 ScopeInfoRegistry The registry of scope instances for a single Context.
 ScopeManager Responsible for managing the scopes associated with a single Context.
 ScopeDefinition The definition for a single scope.
 ScopeName Enumeration for the two builtin scope types.