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data item
subject			fact

data item	is a subtopic of 2.2 - Classes and Objects
	is a kind of programming language construct

Kinds of data item :

• object (4 kinds, 15 facts) (instance, instance: instance is used when you are talking about the role with respect to the class and object is used when talking in a more general way) - A data element in an object-oriented system, which has its own identity, belongs to a particular class, and has behaviour and properties
• variable (8 kinds, 8 facts) - A place where you can put data