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Overview of OWL Ontology File Structure in CmpE 583 - Fall 2006

This document provides a detailed overview of the OWL (Web Ontology Language) file structure as taught in CmpE 583 during Fall 2006. It outlines essential components such as the XML declaration, ontology element, imports, class, property, and individual statements, as well as footer elements. Key insights include namespace declarations, versioning information, and the importance of imports for referencing and extending ontologies. This comprehensive guide serves as an essential resource for understanding ontology file creation and management.

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Overview of OWL Ontology File Structure in CmpE 583 - Fall 2006

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  1. OWL Lite off TextbookCh. 11: Encoding Atilla Elçi CmpE 583 Fall 2006

  2. OWL Ontology File Structure • Header: • XML Declaration & RDF Start Tag • Ontology Element • Version Info • Imports Element • Body: • Class, property, and inidividual statements • Footer: • RDF End Tag. CmpE 583 Fall 2006

  3. OWL Header XML Declaration (?xml) & RDF Start Tag (rdf:RDF): <?xml version=“1.0” encoding=“UTF-8” ?> <rdf:RDF namespaceDeclarations> Three kinds of namespace references are declared: • Standard: xmlns:ns=“URI”. Replace ns & URI with: • XMLS: xsd & http://www.w3.org/2001/XMLSchema# • RDF: rdf & http://www.w3.org/1999/02/22-rdf-syntax-ns# • RDFS: rdfs & http://www.w3.org/2000/01/rdf-schema# • OWL: owl & http://www.w3.org/2002/07/owl# • Imported namespace to use concepts or extend: xmlns:teach=“http://cmpe.emu.edu.tr/aelci/teaching#” Still required to include an “imports” element in the document! • Default / Base (current document) namespace: • xmlns=“http://cmpe.emu.edu.tr/aelci/references#” • xml:base=“http://cmpe.emu.edu.tr/aelci/cmpe583” CmpE 583 Fall 2006

  4. OWL Header(Continued) Ontology Element (owl:Ontology): provides ontology level metadata on the ontology being defined. • <owl:Ontology rdf:about=“URI”> where “URI” is either: • “”: current document, or • “ontologyNameOrReference”: a fully resolved URI. • For example: <owl:Ontology rdf:about=“”> <rdfs:label>A Text as Label</rdfs:label> <rdfs:comment>A text as comment</rdfs:comment> </owl:Ontology> • Version properties may as well be included with the owl:Ontology Element: <owl:Ontology rdf:about=“”> <version-element>Version info</version-element> </owl:Ontology> CmpE 583 Fall 2006

  5. OWL Header(Continued) Versioning Information Properties: • owl:versionInfo element: include a string in the inner text or RCS/CVS keywords • RCS/CVS (revision control/current versions) keywords, such as: <owl:versionInfo>$Id: daml+oil.daml,v 1.1 2001/01/18 15:40:52 timbl Exp $</owl:versionInfo> • owl:priorVersion: to relate current ontology to an earlier version <owl:priorVersion rdf:Resource=“URI of earlier version”/> • owl:backwardCompatibleWith: same format as owl:priorInfo • owl:incompatibleWith: ditto. • owl:DeprecatedClass: identifies a class that is to be removed • owl:DeprecatedProperty: identifies a property ... • The last two elements are placed not in the owl:Ontology element! Format is: <owl:DeprecatedClass rdf:about=“#DefunctClass”> ...</owl:Depre... CmpE 583 Fall 2006

  6. OWL Header(Continued) Importing Ontologies (owl:imports): used in order to reference and extend an external ontology. <owl:imports rdf:resource="http://www.w3.org/2000/01/rdf-schema"/> Contrasting Namespace Declaration & Imports: • Namespace decl identifies a prefix abbreviation, owl:imports does not! • So, include a namespace declaration for an imported ontology as well. • Importing has similar effect as inhereting a class, say in Java. CmpE 583 Fall 2006

  7. OWL Body & Footer • Body: • Contains class and property statements. • Order (sequence) is NOT meaningful! • So, forward references are OK. • Footer: </rdf:RDF> CmpE 583 Fall 2006

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