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Description logic
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==Introduction== A description logic (DL) models ''concepts'', ''roles'' and ''individuals'', and their relationships. The fundamental modeling concept of a DL is the ''axiom''βa logical statement relating roles and/or concepts.<ref name="GHMPPS">{{Cite journal | last1 = Grau | first1 = B. C. | last2 = Horrocks | first2 = I. | author-link2 = Ian Horrocks| last3 = Motik | first3 = B. | last4 = Parsia | first4 = B. | last5 = Patel-Schneider | first5 = P. F. | last6 = Sattler | first6 = U. | author-link6 = Ulrike Sattler| doi = 10.1016/j.websem.2008.05.001 | title = OWL 2: The next step for OWL | journal = Web Semantics: Science, Services and Agents on the World Wide Web | volume = 6 | issue = 4 | pages = 309β322 | year = 2008 | url = http://www.cs.ox.ac.uk/boris.motik/pubs/ghmppss08next-steps.pdf}}</ref> This is a key difference from the [[semantic frames|frame]]s paradigm where a ''frame specification'' declares and completely defines a class.<ref name="GHMPPS"/>
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