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   An integer is a primitive type representing integer values. 
   An instance of Integer	    is an element in the (infinite) set of integers (…-2, -1, 0, 1, 2…). It is used for integer attributes
            and integer expressions in the metamodel. 
   No additional attributes 
   No additional associations 
   No additional constraints 
   Integer is an instance of PrimitiveType. 
   Integer will appear as the type of attributes in the metamodel. Integer	    instances will be values associated to slots such
            as 1, -5, 2, 34, 26524, etc. 
   Examples 

   Figure 12.4 - An example of an integer attribute