Classification is a hierarchical categorisation of specific phenomena or processes (economic, social or demographic). Classifications are characteristic by the subdivision of phenomena and processes from general to more detailed ones. There is a relation of superiority and subordination among classification levels. In classifications, phenomena and processes are usually subdivided into classes and sub-classes, groups and sub-groups, divisions and sub-divisions. According to its individual levels, classification can be split into several code lists.
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Statistical metainformation system
