Information Classes are name of things - like Car, Invoice, Customer. All information classes must belong to one Package.

You can add or change packages if needed.

A Class may inherit all properties of a SuperClass - thus extending the SuperClass definition under a more Specialized name.

SuperClasses after often made Abstract - an abstract class cannot have instances - it acts as a template for SubClasses.

A class has Attributes that keeps information for the class, and Associations that makes it relate to other classes. A class can also have methods that is logic that performs some task.

A special kind of attribute is the State machine - that holds information on how information progress over time within objects in this class

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