OWL

Web Ontology Language (commonly re-arranged, abbreviated as OWL) is the leading ontology domain categorizing and mapping language, supported by the W3C as a formal specification.

OWL is often thought to be the missing link between data and logic, the combination of which would result in knowledge on the web. For that reason, OWL seemed a fitting name as the Owl is a creature that typically represents intelligence, age and wisdom; fitting for the coming of age of a technology (the web) that is designed to unite the world's data to reach a better understanding of all the planet's aspects and complexities.

Specifications

OWL

• OWL 2 Overview: http://www.w3.org/TR/owl2-overview <
• Web Ontology Language (OWL) reference: http://www.w3.org/TR/owl-ref/ (aka. OWL 1)

ref>OWL2 Quick Reference: http://www.w3.org/TR/owl2-quick-reference/</ref>

SPIN

SPARQL Inferencing Notation (SPIN) is a specification for structuring SPARQL queries heavily influenced development of, and is largely to be superseded by "SHACL".

• SPARQL Inferencing Notation (SPIN): https://spinrdf.org/
• SPIN - Modeling Vocabulary: https://spinrdf.org/spin.html

SHACL

Shapes Constraint Language (SHACL) aims to provide a simple language & semantics for formulating structural constraints on "RDF graphs".

• W3C -- Shapes Constraint Language (SHACL): https://www.w3.org/TR/shacl/
• SHACL Use Cases and Requirements: https://w3c.github.io/data-shapes/data-shapes-ucr/

EXAMPLES

The following examples demonstrate the basics of the OWL language.

BC$

• BC$ (OWL/RDF+XML): http://bcmoney-mobiletv.com/ontology/bcmoney.owl

MobileTV

• MobileTV Ontology: http://bcmoney-mobiletv.com/ontology/MobileTV.owl

Recommendation Ontology

• Recommendation Ontology: http://smiy.sourceforge.net/rec/rdf/recommendationontology.owl
• dbrec - music recommendations for and from the Web of Data (uses Recommendation Ontology): http://apassant.net/2010/02/01/dbrec-intelligent-music-recommendations-for-and-from-the-web-of-data/ (now SEEVL and MusicDataGeeks)

Nokia

• Nokia: http://sw.nokia.com/schemas/nokia/DP-1.29.owl

Device Ontology

• Portable (electronic) Device: http://164.125.36.51/ontology/DeviceOntology.owl

Tools

Editors

The exponential growth of the world wide web is often not attributed to the readability of its core presentation language (in fact it took several years before a large enough percentage of academia accepted and understood HTML as a markup language, and eventually the general public had a rough idea of how link and the most common HTML elements worked).

On the contrary, the success of the web, on the back of its core markup language HTML, is largely attributed to the wide availability of comprehensive editors and publishing tools for creating HTML without actually writing or coding in HTML. For several years, the major criticism of OWL was that it lacked such simple editing intrefaces which were both easy to use, but also afforded the author comprehensive use of the language.

Protege

Protege is a free and open ontology editor and knowledge-base framework.

• Protege: http://protege.stanford.edu/
• WebProtege - Online Ontology Editor: http://webprotege-beta.stanford.edu/

SADI

• SADI Framework: http://sadiframework.org/content/
• SADI Plugin For Protege: http://sadi.googlecode.com/svn/trunk/sadi.protege/doc/sadi_plugin.html#owl2code

OntoStudio

OntoStudio and OntoBroker are two desktop applications from Ontoprise GmbH.

• OntoStudio: http://ontoprise.de

TopBraid Composer

• TopBraid: http://agraph.franz.com/tbc/

Validators

Validators are important for checking that a given document or markup adheres to the standards and specifications for that language. Owl has the following validators available for basic type/syntax checking:

• OWL Validator: http://www.mygrid.org.uk/OWL/Validator
• WonderWeb - OWL Ontology Validator: http://www.mygrid.org.uk/OWL/Validator
• Pellet - OWL Consistency Checker: http://www.mindswap.org/2003/pellet/demo.shtml

Triple Stores

• AllegroGraph: http://agraph.franz.com/allegrograph/ (ontology query engine tied to TopBraid & Triple-store Database from Franz, inc.)
• Mulgara: http://www.mulgara.org/ (open-source triple store written entirely in Java)
• Neo4J - BigData Graph Database: http://neo4j.org/

Discovery

• OpenGALEN GRAIL and OWL Sources: http://www.opengalen.org/sources/sources.html
• OWL-S/UDDI Matchmaker: http://uddi.xml.org/news/owl-suddi-matchmaker
• Swoogle Semantic Web Search Engine: http://swoogle.umbc.edu/
• SameAs: http://sameas.org/ (the Web of Data has many equivalent URIs, SameAs helps you find co-references between different data sets)

Reasoners

Reasoners are in the Logic stage of the Semantic Web stack.

• RACER: http://www.racer-systems.com/ (stands for Renamed A-box and Concept Expression Reasoner)
• cb-reasoner -- Consequence-Based Reasoner for OWL ontologies : http://code.google.com/p/cb-reasoner/

Resources

• Welcome to the Protege Ontology Library!: http://protegewiki.stanford.edu/index.php/Protege_Ontology_Library
• jOWL: http://jowl.ontologyonline.org/
• OWL API: http://sourceforge.net/projects/owlapi
• OWL API Project: http://owlapi.sourceforge.net/
• OWL Module Extractor: http://owl.cs.manchester.ac.uk/modularity/
• RDFS and OWL 2 RL generator service: http://www.ivan-herman.net/Misc/2008/owlrl/
• Owl2Java - A Java Code Generator for OWL: http://www.incunabulum.de/projects/it/owl2java

Tutorials

• The Rough Guide to the OWL API: http://owlapi.sourceforge.net/owled2011_tutorial.pdf

External Links

• wikipedia: Web Ontology Language
• wikipedia: Multimedia Web Ontology Language
• An OWL 2 Far?author: Stefan Decker, DERI Galwayauthor: Michel Dumontier, Carleton Universityauthor: Tim Finin, University of Marylandauthor: Ian Horrocks, University of Oxfordchairman: Peter F. Patel-Schneider, Bell Labs, Alcatel-Lucent: http://videolectures.net/iswc08_panel_schneider_owl/

See Also

Semantic Web | RDF | RDFS | n3