Ontologies Here is a small selection of existing OWL ontologies that you might want to try. An efficient way of detecting other owl ontologies is using Google: http://www.google.com/search?q=filetype:owl+owl. There is also a new Semantic Web search engine called Swoogle. Download the .owl files and use the "Create New Project..." function (from existing sources) to load them into Protege-OWL (version 3.1 or above). In most cases, you can directly open the ontologies from the web - just paste the URL of the .owl file into the "Create New Project..." dialog. Getting Started Pizza Ontology — The ontology used in the Protege-OWL Tutorial. Contributed by The CO-ODE Project.   travel.owl — A tutorial ontology for a Semantic Web of tourism. Contributed by Holger Knublauch.   Other Ontologies amino-acid.owl — A small ontology of amino acids and their properties. Source: Amino Acid Ontology Web Site.   biopax-level1.owl — An OWL ontology for biological pathways. It will be used as a data exchange format between biological databases. Source: BioPAX group.   camera.owl — An ontology about the individual parts of a photo camera. Source: XFront OWL Tutorial.   countries.owl — The ISO 3166 Code List of countries. Contributed by Dieter E. Jenz.   DOLCE — Dolce foundational ontology and its extensions provide a domain-independent framework to build ontologies on the basis of highly-reusable patterns. Contributed by Aldo Gangemi.   EHROntology — An Electronic Health Records ontology based on openEHR work. Contributed by Isabel Román Martínez.   ESG — An ontology describing very large simulation datasets and related information for climate sciences such as those found in the Earth System Grid project. Contributed by Line Pouchard.   family.swrl.owl — A SWRL/OWL demo ontology about family relationships . Contributed by Christine Golbreich.   fgdc-csdgm.owl — Ontology for Content Standard for Digital Geospatial Metadata (CSDGM) of Federal Geographic Data Committee (FGDC). Contributed by Akm Saiful Islam, Bora Beran , Volkan Yargici and Michael Piasecki.   fsm.owl — A simple ontology for finite state machines. Contributed by Peter Dolog.   generations.owl — An ontology about family relationships that demonstrates classification. Contributed by Matthew Horridge.   hu.owl — A hierarchic division of hydrologic units. Contributed by Luis Bermudez.   iso-metadata.owl — Several ISO Geographic Information Ontologies developed with Protege-OWL. Contributed by Akm Saiful Islam, Bora Beran, Luis Bermudez, Stephane Fellah & Michael Piasecki.   ka.owl — Defines concepts from academic research. Contributed by Ian Horrocks.   koala.owl — A simple ontology about humans and marsupials. Contributed by Holger Knublauch.   MGEDOntology.owl — An ontology for microarray experiments in support of MAGE v.1. Source: the MGED Society.   NCI Thesaurus — A huge ontology developed by the National Cancer Institute (NCI). Source: NCI Enterprise Vocabulary Services.   not-galen.owl — A selective adaptation made in 1995 of an early prototype GALEN model; content is not related to or representative of any current or historical OpenGALEN release. Contributed by Ian Horrocks.   OGC Ontology for Geography Markup Language (GML3.0) of Open GIS Consortium (OGC). Contributed by Contributors: Zafer Defne, Akm Saiful Islam and Michael Piasecki.   OKAR — An Ontology for Knowledge Activity Resources, describing office activities. Contributed by Hiroshi Tsuda.   people+pets.owl — From the ISWC03 tutorial on OWL by Sean Bechhofer, Ian Horrocks and Peter Patel-Schneider.   Petrinet Semantic Web Infrastructure — Contributed by Dragan Gasevic.   resume.owl — An ontology to document relevant information about a person's career. Contributed by John A. Yanosy Jr.   SemanticBible — An emerging exploration of new applications of markup and computational linguistic technology to the study of Scripture.   Surface-Water-Model-Ontology — An ontology for surface water and water quality models currently exists based on the list provided SMIC, US Geological Survey using Protégé. Contributed by Akm Saiful Islam.   SWEET Ontologies — A Semantic Web for Earth and Environmental Terminology. Source: Jet Propulsion Laboratory.   shuttle-crew-ont.owl — An ontology about the crew from a space shuttle. Source: Dynamic Research Corporation.   tambis-full.owl — An biological science ontology developed by the TAMBIS project. Contributed by Ian Horrocks.   wine.owl — The infamous wine ontology (demonstrates project inclusion). Original source: WebOnt OWL Guide.   Tool and Task — An ontology that is used to model Task and Tool features for project realization. Contributed by Marek Szlezak.   Wood Ontology — Contributed by Muhammad Abulaish & Lipika Dey.