What is the difference between a SimpleInstance and an Instance?
Protege, all frames are instances of some class. This class is, inversely, the direct type of the instance. If a frame is an instance of a metaclass, then it is also a class. If it is an instance of a regular class, then it is a simple instances. An instance can only have one direct type. Through the API, it is easy to determine if an instance is a “simple Instance” by using the instanceof operator. The term “instance” used here should not be confused with the instance of the real world which is an individual like John Smith, or the liver of John Smith.
