| http://www.w3.org/ns/prov#value | - But if the compiler does not know the types of the variables, it can not warn you that you have made an invalid call, instead, an error occurs at runtime...and since dynamically-typed languages do not check the type of parameters passed in to methods, that problem occurs whenever your code attempts to use customer-only properties of the james object, or employee-only properties of the bob object.
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