Introduction to OWL
OWL is a language for processing web information.
What You Should Already Know
Before you study OWL you should have a basic understanding of XML, XML
Namespaces and RDF.
If you want to study these subjects first, please visit:
W3Schools' XML Tutorial and
RDF Tutorial.
What is OWL?
- OWL stands for Web Ontology Language
- OWL is built on top of RDF
- OWL is for processing information on the web
- OWL was designed to be interpreted by computers
- OWL was not designed for being read by people
- OWL is written in XML
- OWL has three sublanguages
- OWL is a web standard
What is Ontology?
Ontology is about the exact description of things and their
relationships.
For the web, ontology is about the exact description of web information and
relationships between web information.
Why OWL?
OWL is a part of the "Semantic Web Vision" - a future where:
- Web information has exact meaning
- Web information can be processed by computers
- Computers can integrate information from the web
OWL was Designed for Processing Information
OWL was designed to provide a common way to process the content of web
information (instead of displaying it).
OWL was designed to be read by computer applications (instead of humans).
OWL is Different from RDF
OWL and RDF are much of the same thing, but OWL is a stronger language with
greater machine interpretability than RDF.
OWL comes with a larger vocabulary and stronger syntax than RDF.
OWL Sublanguages
OWL has three sublanguages:
- OWL Lite
- OWL DL (includes OWL Lite)
- OWL Full (includes OWL DL)
OWL is Written in XML
By using XML, OWL information can easily be exchanged between different types
of computers using different types of operating system and application
languages.
OWL Example (Airport)
OWL Resource:
http://www.daml.org/2001/10/html/airport-ont
Class:
Airport
Properties:
Produced using
dumpont2.java
OWL is a Web Standard
OWL became a W3C (World Wide Web Consortium) Recommendation in February 2004.
A W3C Recommendation is understood by the industry and the web community as a
web standard. A W3C Recommendation is a stable specification developed by a W3C
Working Group and reviewed by the W3C Membership.
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