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FOX Version 0.1

July 6, 2011 - 2:57 pm by AxelNgonga - One comment »

We are thrilled to announce the first version of the Federated knOwledge eXtraction (FOX) framework. FOX integrates and merges the results of frameworks for Named Entity Recognition, Keyword/Keyphrase Extraction and Relation Extraction by using machine learning techniques. By these means, FOX can generate RDF out of natural language with improved accuracy. FOX has been shown to be up to 15% more accurate than other frameworks, including commercial software. More information at http://fox.aksw.org.

Stay tuned for more releases,
Axel

Official DBpedia Live Release

June 24, 2011 - 11:48 am by Jens Lehmann - One comment »

The AKSW group is pleased to announce the official release of DBpedia Live. The main objective of DBpedia is to extract structured information from Wikipedia, convert it into RDF, and make it freely available on the Web. In a nutshell, DBpedia is the Semantic Web mirror of Wikipedia.

Wikipedia users constantly revise Wikipedia articles with updates happening almost each second. Hence, data stored in the official DBpedia endpoint can quickly become outdated, and Wikipedia articles need to be re-extracted. DBpedia Live enables such a continuous synchronization between DBpedia and Wikipedia. There was a preliminary PHP based DBpedia Live extraction framework available, which was, however, based on an older version of the DBpedia extraction framework and did not contain all necessary features to synchronise properly with Wikipedia.

The DBpedia Live framework has the following new features:

  1. Migration to the new Java/Scala DBpedia framework.
  2. Support of clean abstract extraction.
  3. Automatic reprocessing of all pages affected by a schema mapping change at http://mappings.dbpedia.org.
  4. Automatic reprocessing of pages that are not changed for more than one month. The main objective of that feature is to that any change in the DBpedia framework, e.g. addition/change of an extractor, will eventually affect all pages. It also serves as fallback for technical problems in Wikipedia or the update stream.
  5. Publication of all changesets.
  6. Provision of a tool to enable other DBpedia mirrors to be in synchronization with our DBpedia Live endpoint. The tool continuously downloads changesets and performs changes in a specified triple store accordingly.

Important Links:

For further questions, please use the mailing-list at dbpedia-discussion@lists.sourceforge.net. We thank our partners at the FU Berlin and OpenLink for their support.

LinkedGeoData Release 2

April 27, 2011 - 6:32 pm by ThomasRiechert - 2 comments »
The AKSW research group is happy to announce a new release of LinkedGeoData!

The aim of the LinkedGeoData (LGD) project is to make the OpenStreetMap (OSM) datasets easily available as RDF. As such the main target audience is the Semantic Web community, however it may turn out to be useful to a much larger audience. Additionally, we are providing interlinking with DBpedia and GeoNames and integration of class labels from translatewiki and icons from the Brian Quinion Icon Collection.

The result is a rich, open, and integrated dataset which we hope to be useful for research and application development. The datasets can be publicly accessed via downloads, Linked Data, and SPARQL-endpoints. We have also launched an experimental “Live-SPARQL-endpoint” that is synchronized with the minutely updates from OSM whereas the changes to our store are republished as RDF.

The improvements over the somewhat aged previous release in the middle of 2009 can be summarized as:

  • Better data quality thanks to a more flexible mapping system.
  • Spatial query support as supported by OpenLink’s Virtuoso enterprise edition.
  • Two Sparql-endpoints: one containing the data of the most recent LGD release,
  • and one experimental one synchronzied with OpenStreetMap.org!
  • More interlinking
  • Improvements on the LGD-Browser (however this is work in progress)

We would like to thank the whole AKSW group and OpenLink for their support in making this release possible. Furthermore this work is acknowledged by the European Union within the LOD2 project.

Example Links:

Sparql-Queries: See http://linkedgeodata.org/OnlineAccess/SparqlEndpoints
Live-Sync-Status page (work in progress): http://live.linkedgeodata.org/status
Ontology: http://linkedgeodata.org/ontology/
LGD-Browser: http://browser.linkedgeodata.org/
Linked Data Example: http://linkedgeodata.org/triplify/node264695865
Published Changesets: http://downloads.linkedgeodata.org/releases/110406/changesets/
based on: http://planet.openstreetmap.org/minute-replicate/

Navigational Knowledge Engineering (NKE) and HANNE

December 14, 2010 - 5:00 pm by Sebastian Hellmann - No comments »

Over the last year, we have worked on a methodology called Navigational Knowledge Engineering – in short NKE.

We have amounted a good deal of documents, a web demo (HANNE) , source code and images, which we publish and link to on this page:http://aksw.org/Projects/NKE

Summary:
NKE is a light-weight methodology for low-cost knowledge engineering by a massive user base. Although structured data is becoming widely available, no other methodology – to the best of our knowledge – is currently able to scale up and provide light-weight knowledge engineering for a massive user base. Using NKE, data providers can publish flat data on the Web without extensively engineering structure upfront, but rather observe how structure is created on the fly by interested users, who navigate the knowledge base and at the same time also benefit from using it. The vision of NKE is to produce ontologies as a result of users navigating through a system. This way, NKE reduces the costs for creating expressive knowledge by disguising it as navigation.

We would also like to steer your attention to the Web Demo at http://hanne.aksw.org, the Tutorial slides for the Web demo and two mockups, which visualize how the methodology could be integrated into Wikipedia and Amazon.com .

As we believe that the methodology is quite novel (please tell us in case you know something similar), we are still discussing all possible applications and implications. In particular, we are searching for suggestions, where to integrate and test our methodology next. Please feel free to contact us.

Special thanks to Markus Strohmaier (TU Graz)

Sebastian Hellmann, Jens Lehmann, Jörg Unbehauen and Claus Stadler

Links:
Main Page: http://aksw.org/Projects/NKE
Web demo: http://hanne.aksw.org
Tutorial slides: http://svn.aksw.org/papers/2011/WWW_NKE/hanne_tutorial/hanne_tutorial_public.pdf
Mockups: http://aksw.org/Projects/NKE#Mockups

Software release: LIMES – Link Discovery Framework for Metric Spaces

November 19, 2010 - 1:36 pm by Sören Auer - One comment »

The first public release of the LIMES framework (Link Discovery Framework for Metric Spaces) is available for download at:

http://limes.sf.net

LIMES implements time-efficient and lossless approaches for large-scale link discovery based on the characteristics of metric spaces. It is typically more than 60 times faster that other state-of-the-art link discovery frameworks.

LIMES is available:

  • as a standalone Java tool for carrying out link discovery on a local server (faster). In this case, LIMES must be configured via an XML file,
  • via the easily configurable web interface of the LIMES Linking Service at http://limes.aksw.org (results can be downloaded as nt-files).