In object-oriented programming, a metaclass is a class whose instances are classes.
Just as an ordinary class defines the behavior of certain objects, a metaclass defines the behavior of certain classes and their instances. Not all object-oriented programming languages support metaclasses.
Among those that do, the extent to which metaclasses can override any given aspect of class behavior varies.
Each language has its own metaobject protocol, a set of rules that govern how objects, classes, and metaclasses interact.
Often [[Namespaces]] are used as identifiers in Metaclasses, to distinguish different classes.
==Derive new object==
To generate a new metaclass just right-click on the sourceclass (e.g., the Baseclass) and choose Derive new object.
After this the class´s name can be changed in the bottom window ( [[Details]] )