Incorrect Enumeration Types

The eight Enumeration types defined in the ExchangeEnumerations package are not modelled properly. According to the methodology, types must be either classes with a <<datatype>> stereotype or UML Enumerations. The eight classes are used as types but are neither of those. CompressionMethodEnum doesn't seem to be used at all. Concequently, the seven attributes that denote the seven used UML classes of that package as their type are vialoating the methodology: "UML Attributes shall have an assigned "type" element. The assigned type shall be a UML Class with UML Stereotype <<datatype>> (Note that built-in UML types are not allowed) or it shall be a UML Enumeration.".