Why are some searchable sites listed more than once in the CompletePlanet browse tree?
CompletePlanet is rare in allowing its results to be placed in more than one location in its browse subject tree. Most Web directories allow one and only one placement of a given result. A single-placement objective derives from library practice and made sense when cost and bulk dictated that books be placed in only one location on the library s shelves. Ontologies such as the Dewey Decimal Classification system and the Library of Congress Subject Headings are aids that help librarians make this assignment, and card catalogs provide a cross-reference point for those seeking specific books. These imperatives do not apply to electronic representation of results on the Internet, since the cost of placing documents in more than a single location is in essence zero. Because no ontology is perfect and there are many ways that documents can be classified, CompletePlanet allows up to five placements of a given result in different subject nodes.
