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variable
subject			fact

variable	can contain different classes of objects depending on the type of the variable
	can refer to a particular object, several different objects during the execution of a program, or no object at all
	has definition A place where you can put data
	has scope
	has type
	is a subtopic of 2.3 - Instance Variables
	is a kind of data item
	should have comment if it is non-obvious

Kinds of variable :

• attribute (15 facts) - A simple data item present in all the instances of a class
• class variable (1 kind, 8 facts) (static variable) - A data item present in a class that is shared by all instances of that class
• global variable (5 facts) - A variable that is accessible from all procedures in the system, or in the scope of just a specific set of modules (e.g. a Java package).
• instance variable (1 kind, 7 facts) (data member, field) - A data item present in all the instances of a class, normally used to implement associations and attributes
• Java variable (2 kinds, 6 facts)
• reference (3 facts) - A variable that refers to an object
• variable declared as a non-primitive data type (5 facts)
• variable declared as primitive data type (3 facts)