A Data Mining System is a Computing System that can solve a Data Mining Task.
day attribute could involve next day, previous day, next week, same day next week. Partial orderings, that, generalize/specialization relations, frequently occur in practical situations. Information this kind is often referred to as metadata, data about data. However, the kind of practical schemes currently used for data mining are rarely capable of taking metadata into account, although it is likely that these capabilities will develop rapidly in the future.