= MetaObjectProtocol (aka. MOP) =

Is a standard to define the (dynamic) behaviour of the MetaClasses that establish the 
CommonLispObjectSystem. This includes the creation, modification and instantiation of classes, Objects (instances) and Methods.

see e.g.:
 * [http://www.lisp.org/mop/index.html]
 * [http://en.wikipedia.org/wiki/Meta-object_protocol]