A MultiColumnFeature is a feature. It represents a conceptual bundle of attributes of
a concept. Thus, it consists of at least two BaseAttributes. For example,
a MultiColumnFeature ``Address'' may be used to bundle the BaseAttributes ``Street'', ``City''
and ``TelephoneNumber''. MultiColumnFeatures are a conceptual device in MiningMart
which may be used to structure the concepts in order to give a more intuitive view on the business data.