The ObjectType FolderType is formally defined in OPC 10000-5. Its purpose is to provide Objects that have no other semantic than organizing of the AddressSpace. A special ReferenceType is introduced for those Folder Objects, the Organizes ReferenceType. The SourceNode of such a Reference should always be a View or an Object of the ObjectType FolderType; the TargetNode can be of any NodeClass. Organizes References can be used in any combination with HasChild References (HasComponent, HasProperty, etc.; see 7.5) and do not prevent loops. Thus, they can be used to span multiple hierarchies.