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                      CUSTOM => {}
                     });
 
Attention should be given to the B<PROTOTYPE> attribute in the above 
illustration where we can see an example of how the prototype properties are 
implemented.
 
The above illustrates how to define the various restrictions to a particular 
property.  Keep in mind that this is only the prototype so it does not directly 
deal with data passed into a constructor.  One way of seeing it is as a template 
that is overlayed with the actual data from the constructor.
 
Providing a definition of a property is always optional.  If none is provided then 
various logical defaults apply.  If one does not provide definitions then it will 
be considered that the elements (or properties) in the prototype are not exclusive 
but they are required.  In other words one could add properties dynamically but the 
constructor of the user class would need to have at the very least the properties 
of the prototype passed to it.
 
The OOP class guesses that it is a property definition by finding the keyword 
I<dataType> which happens to be the only reserved keyword (for a hash key).  This means that when a user