REGISTRY UserNotificationHandler/UserNotificationDefinition
REGISTRY WebDAVStorage
REGISTRY xmlRpcMethodInstances
REGISTRY ControlPanelEntry
REGISTRY AssetRendererFactory
REGISTRY AtomCollectionAdapter
REGISTRY CustomAttributesDisplay
REGISTRY DDMDisplay
REGISTRY PermissionPropagator
REGISTRY TrashHandler
REGISTRY WorkflowHandler
REGISTRY PreferencesValidator
REGISTRY no need to explicitely unregister individual items
REGISTRY portlet ResourceBundle