Convert enum data type definition into a dictionary. Overrides the
        super class method to add list of enumeration values.

        Returns
        -------
        dict
            Json-like dictionary representation of the attribute data type

def to_dict(self):
        """Convert enum data type definition into a dictionary. Overrides the
        super class method to add list of enumeration values.

        Returns
        -------
        dict
            Json-like dictionary representation of the attribute data type
        """
        obj = super(EnumType, self).to_dict()
        obj['values'] = self.values
        return obj