This is a "tree of all knowledge" category, a top-level place to start when browsing Wikipedia categories for articles. This is the top level in terms of encyclopedia article function and content. It is intended to contain all and only the few most fundamental ontological categories which can reasonably be expected to contain every possible Wikipedia article under their category trees. These categories are: physical entities; biological entities; social entities; and intellectual entities.
An alternative root category, based on a somewhat more detailed initial classification, is Category:Main topic classifications.
This is a list of Wikipedia's major topic classifications. These are used throughout Wikipedia to organize the presentation of links to articles on its various reference systems, including Wikipedia's lists, portals, and categories.
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A. Carlson, J. Betteridge, E. Hruschka, и T. Mitchell. SemiSupLearn '09: Proceedings of the NAACL HLT 2009 Workshop on Semi-Supervised Learning for Natural Language Processing, стр. 1--9. Morristown, NJ, USA, Association for Computational Linguistics, (2009)
D. Romero, B. Meeder, и J. Kleinberg. Proceedings of the 20th international conference on World wide web, стр. 695--704. New York, NY, USA, ACM, (2011)