kiss
				ExtensionFactory<E>
				E>This is an extension point to dynamically create and retrieve an extension corresponding to a given extension key at the associated extension point.
create(Classkey)E
				Classkey)Classkey | 
						An extension key.  | 
					
E | 
						A created extension.  | 
					
Gets the extension corresponding to the given extension key at the associated extension point.