We are happy to announce the next release of DL-Learner, a tool for learning OWL class expressions from examples and background knowledge. It extends Inductive Logic Programming (ILP) to Description Logics and the Semantic Web. The tool has matured over the past 3 years and is meanwhile used in a number of applications. Some features of this release are:

• support for OWL API 3 and OWL 2
ORE (ontology repair and enrichment) tool based on DL-Learner algorithms (soon to be migrated to an own project)
• several new heuristics, e.g. generalised F-Measure, and efficient stochastic heuristic approximation methods
• learning algorithms for the EL description logic
• support for hasValue construct in combination with string datatype
• support for refining existing definitions (instead of learning from scratch) for CELOE ontology engineering algorithm
• support for direct Pellet 2 integration and reasoners connected via OWLlink
• more unit tests, bug fixes and features

DL-Learner can be used to:

• solve general supervised Machine Learning problems using ontologies as background knowledge (given as OWL files, SPARQL endpoints, etc.), e.g. it was used to predict whether chemicals can cause cancer
• help knowledge engineers by learning definitions and subclass axioms (see the Protege plugin and OntoWiki plugin)
• generating user recommendations when browsing knowledge bases

I’d like to thank all contributors, in particular active developers and everyone who sent us valuable feedback.

The tool can be be downloaded here.

The Open Knowledge Foundation Working Group on EU Open Data (where AKSW is an active member) is organising a session on linked government data at the ICT2010 event in Brussels later this year.

• Where? T 003, Brussels Expo
• When? 11:00-12:30 CET, 28th September 2010

This networking session will discuss how public access to government data – crucial for an open and transparent society – can be improved.

This session has been proposed by IT professionals, scientists and government representatives organised – under the auspices of the Open Knowledge Foundation – as the Working Group on EU Open Data. It aims to establish a forum for networking and exchanging ideas with regard to publishing and linking governmental data, identifying technological developments and showcasing successful cases of linked governmental data. Developments in linked data could help further integrate information published by regional, national and European public administrations. The session is thematically relevant to a number of pillars within the Framework Programme as well as the Competitiveness and Innovation Programme.