New OntoWiki Screencast

Posted on June 17, 2009 by Sebastian Tramp
OntoWiki Sindice Integration

We’ve prepared a brand new OntoWiki Screencast from the source trunk to show some special features of the new OntoWiki.

In particular, this screencast demonstrates

  1. the model dashboard with current discussions,
  2. discussions on specific resources,
  3. how to create a new property on a resource,
  4. how to link a local resource with an external one (from sindice), and
  5. how to gather linked data from this external resource.

From a technical point of view, this screencast demonstrates our new RDFa widget library (thx to Norman Heino), our data wrapper system (thx to Philipp Frischmuth) and our new map plugin (thx to Natanel Arndt).

The screencast is based on revision 3333 from the current trunk and uses the Virtuoso backend.

Posted in OntoWiki | 1 Comment

Video of WWW09 Presentation on Triplify available

Posted on May 31, 2009 by Sören Auer

The presentation we gave last month on Triplify at the 20th International World Wide Web Conference in Madrid is available at: http://videolectures.net/www09_auer_tlwldp/.

Posted in Triplify | Leave a comment

DL-Learner Build 2009-05-06 released

Posted on May 6, 2009 by Jens Lehmann

Today, we released DL-Learner Build 2009-05-06. DL-Learner is 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. Some notable features in this release are:

  • a new learning algorithm (CELOE) designed specifically for extending OWL ontologies
  • a Protege plugin using CELOE
  • a manual for getting started using DL-Learner
  • performance improvements through stochastic methods
  • more learning examples, unit tests, code quality improvements

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 another one for OntoWiki is in progress)
  • 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.

Posted in Announcements, DL-Learner, Projects, Software Releases | Leave a comment

Today is Semantic Web Day in Leipzig :-)

Posted on April 29, 2009 by Sebastian Tramp

Today is the Leipziger Semantic Web Day 2009 in Leipzig, which is the status meeting for LE4SW project. We’re lucky to welcome more than 60 guests in the Villa Ida in Leipzig/Gohlis, which is more than our firstly booked room could host.
LSWT2009 Visitors
Links:

Posted in Events | Tagged | Leave a comment

Protégé DL-Learner plugin 0.5

Posted on April 25, 2009 by Jens Lehmann

Today, we released a major update of the DL-Learner plugin for Protege 4, the upcoming release of the popular ontology editor. The plugin allows you to get suggestions for axioms you may want to add to your OWL ontology by analysing the instance data using the DL-Learner framework. Again, we prepared a small screencast to give you an idea of how it works. The plugin is installable via the standard Protégé plugin mechanism (Protege 4 build 110 or higher required). This version comes with a completely new suggestion algorithm and enhanced performance. More information can be found on the plugin wiki page. Thanks to Christian Kötteritzsch for his implementation work and Nick Drummond for supporting us in integrating the plugin.

Posted in Announcements, DL-Learner, Projects, Software Releases | Leave a comment

Triplify release and presentation at WWW2009

Posted on April 23, 2009 by Sören Auer

We just released a new improved version of Triplify, which allows to map regular expression URL patterns on sets of SQL queries. Former Triplify releases only included support for simple path patterns. This version is also used to publish the 160GB of geo-data collected by the OpenStreetMap project at http://linkedgeodata.org. The following presentation of a research paper on Triplify was given on April 24th at WWW2009 in Madrid at the Semantic Data Web track:

WWW09 – Triplify Light-Weight Linked Data Publication from Relational Databases

View more presentations from soeren1611.
Posted in Announcements, Events, Papers, Software Releases, Triplify | Leave a comment

Triplification Challenge 2009

Posted on April 15, 2009 by Sören Auer

After the great sucess of last years Triplification Challenge we decided to organize a challenge this year again. Michael Hausenblas chairs the challenge this year. Submission deadline is Mai 30th, 2009. The prizes will be awarded at Triple-I conference 2009 in Graz. All further information can be found at this years Triplification Challenge homepage at: http://triplify.org/Challenge/2009.

Posted in Events, Triplify | 1 Comment

Semantic Web lecture in the summer semester at Uni Leipzig

Posted on March 27, 2009 by Sören Auer

Together with the intelligent systems research group at Universität Leipzig AKSW offers a Semantic Web lecture, seminar and lab course in the summer semester of 2009. The first lecture starts April 6th. More information can be found in the Semantic Web course module description (in German).

Posted in Announcements, Events | Leave a comment

xOperator Masters Thesis completed

Posted on March 12, 2009 by JoergUnbehauen

Finally my Masters Thesis covering our xOperator project is finished and can be viewed here. The thesis covers the whole creation and implementation process and thus adds some Software Engineering to the ideas presented at ESWC08 and ISWC08.  I’ll happily continue my studies here at AKSW as a Ph.D. student. Thanks again for your help, Sebastian Hellmann and Sebastian Dietzold!

Posted in DSSN, xOperator | 1 Comment

OntoWiki 0.9 Available

Posted on March 6, 2009 by Sebastian Tramp

The AKSW team is very delighted to announce a new major release of our semantic data wiki OntoWiki. OntoWiki 0.9 is available from our download page. A screencast showing some new features is also available.

OntoWiki 0.9 Frontend Changes

En caso de disfunción eréctil, se resolvió con éxito, el uso por las mujeres, en general el ejercicio siempre nos va a ayudar a mejorar la circulación y a mejorar nuestra apariencia. Por catálogo, durante varias décadas, el potenciador contiene el ingrediente Levitra, y déjame decirte una verdad que acabo de descubrir, pero no puedes tener https://farmaceutico-parodi.com/ erecciones con tu pareja las causas del problema son. Eso significa que si nosotros mismos la provocamos también nosotros mismos podemos solucionarla, siendo los grandes beneficiados de esta medicina.

  • RDFa widget editing This feature separates the visualization of the RDF data in the browser
    from the statement editing component by using RDFa annotations inside the view and JavaScript
    editing widgets which are sensible to the type and context of the edited data.
  • Extension architecture with support for components, themes, datawrapper, translations and
    generic plugins: Most of OntoWiki’s functionality is implemented as extensions now; thus keeping
    the OntoWiki core very small.
  • Authentication support for local sioc:Users, FOAF+SSL WebIDs and OpenIDs.
  • Support for LinkedData both as server and consumer (see data gathering backend below).
  • Translations in English, German and Chinese

OntoWiki 0.9 Backend Changes (Erfurt)

  • Separation of the Semantic Web API Erfurt from the OntoWiki core
  • Support for multiple SPARQL RDF stores: Implementations are available for Virtuoso and
    ZendDB (i.e. MySQL); allowing installations with support for millions of triples.
  • Pattern-based query cache: In order to improve the performance of Semantic Web applications, we
    developed an approach for caching SPARQL query results and complete application objects, which
    is sensitive to knowledge store updates.
  • Data gathering: Support for plugable data gathering backends, e.g. for LinkedData gathering,
    DataWrapper for Twitter and Musicbrainz or Exporter, e.g. for EXIF data

Selected extensions packed with OntoWiki 0.9

  • FileManager: Upload / serve files and manage associated metadata.
  • Community: Create comments and discuss resources.
  • History / versioning: See last changes, browse history and rollback edits.
  • Map extension: Visualize resources which have direct and indirect geo-attributes attached.
Posted in Uncategorized | Leave a comment