%0 Book Section %1 guarino2009ontology %A Guarino, Nicola %A Oberle, Daniel %A Staab, Steffen %B Handbook on Ontologies %D 2009 %E Staab, Steffen %E Studer, Dr. Rudi %E Bernus, Peter %E Błażewicz, Jacek %E Schmidt, Günter J. %E Shaw, Michael J. %I Springer Berlin Heidelberg %K classification definition ontologies %P 1-17 %T What Is an Ontology? %U http://dx.doi.org/10.1007/978-3-540-92673-3_0