In the W3C Recommendation of 27 October 2009 the OWL 2 Web Ontology Language is presented. The primer provides an approachable introduction to OWL 2, including orientation for those coming from other disciplines. Visit W3C

Location & date: Frankfurt – Germany Tuesday, December 15 at 5:00 PM   Description: Zuerst: Die initiale Start-Up Gruppe trifft sich um die nächsten Schritte zu diskutieren. Alle sind herzlich willkommen. Ideen und konkrete Beiträge hoch erwünscht. Dann: Ein Ueberblick über realisierte Semantic Web Applications von verschiedenen Anbietern in der Banken- und Versicherungswelt wird von Leo Keller, Blue Ocean SWS GmbH gegeben   More information: http://www.meetup.com/Frankfurt-Semantic-Web-Meetup/calendar/11992164/http://www.meetup.com/Frankfurt-Semantic-Web-Meetup/calendar/11992164/

RDF is short for Resource Description Framework. RDF is the language for describing resources and contents in the semantic web. In the semantic web RDF is used to describe resources on the web. Resources are addressed by a unique URI. A URI looks like a normal Internet URL. Look at the following fragment of a RDF file: <?xml version="1.0"?> <rdf:RDF     xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"     xmlns:owl="http://www.w3.org/2002/07/owl#"     xmlns:xsd="http://www.w3.org/2001/XMLSchema#"     xmlns="http://example.org/pets#"     xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"   xml:base="http://example.org/pets">   <owl:Class rdf:ID="Goldfish"> [...]

Describing things in a way that computer applications can understand it. The semantic web describes relations between concepts. For example: A isPartOf B B hasType C C isMemberOf D Also properties of concepts can be described: A hasAge X B hasSize X C has Length X Where in this case X could be of type Integer.

December 3rd Protege 4.0 was released. So, what is new in this version? First of all it supports the OWL 2.0 specification, which is approaching approval. Other new features in this release are: support for editing multiple ontologies, menu drag and drop user interface elements, the ability to import from repositories on the web and more. Anyway, you can download it here.

Are you getting errors about the “RA layer request failed” and “svn: PROPFIND request failed on ..”, followed by an error about not being able to connect to the SVN server? Well, here is what to do: Install the latest Subclipse plugin for Eclipse. Read the manual at Subclipse Set the right proxy settings at the Subversive-config-file (usuallylocated at C:\Documents and Settings\MyUserId\Application Data\Subversion\servers). At the bottom of the file you’ll find http-proxy-host and http-proxy-port. Uncomment [...]