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Developed by Melvil Dewey in 1876; it has been greatly modified and expanded through 22 major revisions, the most recent in 2003.
The DDC attempts to organize all knowledge into ten main classes. The ten main classes are each further subdivided into ten divisions, and each division into ten sections, giving ten main classes, 100 divisions and 1000 sections.
DDC's advantage in using decimals for its categories allows it to be both purely numerical and infinitely hierarchical.
Developed by the Belgian bibliographers Paul Otlet and Henri La Fontaine at the end of the 19th century.
Based on the Dewey Decimal Classification, but uses auxiliary signs to indicate various special aspects of a subject and relationships between subjects. It thus contains a significant faceted element, and is used especially in specialist libraries.
A work that lists words grouped together according to similarity of meaning (containing synonyms and sometimes antonyms), in contrast to a dictionary, which contains definitions and pronunciations. Examples: LCSH.
In computer science and information science, an ontology is a formal representation of a set of concepts within a domain and the relationships between those concepts.
Used in artificial intelligence, the Semantic Web, systems engineering, software engineering, biomedical informatics, library science, enterprise bookmarking, and information architecture as a form of knowledge representation about the world or some part of it. Examples: OWL, RDF, Topic Maps.