LOD2: State of Play WP3B - Knowledge Extraction, NLP2RDF + NIF
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The document outlines the deliverables related to knowledge extraction from structured sources as part of the LOD2 project, highlighting the definition of knowledge extraction and the development of a tool server. It emphasizes the integration of NLP tools through an ontological interface and the use of the NLP interchange format (NIF) to enable interoperability. Key tools mentioned include OpenCalais, DBpedia Spotlight, and Stanford Parser, with ongoing iterations for feedback and improvement.
LOD2: State of Play WP3B - Knowledge Extraction, NLP2RDF + NIF
- 1. Creating Knowledge out of Interlinked Data D3.1.1 - Knowledge Extraction D3.2.1 - NLP2RDF + NIF Sebastian Hellmann AKSW, Universität Leipzig LOD2 Presentation . 02.09.2010 . Page http://lod2.eu
- 2. Creating Knowledge out of Interlinked Data D 3.1.1 Knowledge Extraction from Structured Sources • Results of the Deliverable (1): • Definition of Knowledge Extraction on Wikipedia (Provide an easy entry point for interested users) LOD2 Event . 06.09.2010 . 2Page 2 http://lod2.eu
- 3. Distinction to Information Extraction and ETL and Ontology Learning How can we define Knowledge? 3
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- 5. Creating Knowledge out of Interlinked Data D 3.1.1 Knowledge Extraction from Structured Sources • Results of the Deliverable (2): • Tool Server on http://data.lod2.eu/2011/tools/ • Survey available at http://tinyurl.com/KETSurvey LOD2 Event . 06.09.2010 . 5Page 5 http://lod2.eu
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- 9. Creating Knowledge out of Interlinked Data D 3.1.1 Knowledge Extraction from Structured Sources • Integration of Knowledge Extraction tools is done over the format RDF and reusing vocabularies LOD2 Event . 06.09.2010 . 9Page 9 http://lod2.eu
- 10. Creating Knowledge out of Interlinked Data D 3.2.1 NLP2RDF + NIF NLP2RDF + NIF • Vision: Integration of NLP tools based on an Ontological Interface • String Ontology • Structured Sentence Ontology • OLiA • POWLA • NLP Interchange Format(NIF) allows NLP tools to interoperate • NLP2RDF provides a reference implementation LOD2 Event . 06.09.2010 . 10 Page 10 http://lod2.eu
- 11. Creating Knowledge out of Interlinked Data D 3.2.1 NLP2RDF + NIF • Basic idea: adress Strings with URIs • Use the expressiveness and flexibility of RDF to add arbitrary annotations • Several formats: • NIF-OWL • NIF-RDFa • NIF-POWLA LOD2 Event . 06.09.2010 . 11 Page 11 http://lod2.eu
- 12. Creating Knowledge out of Interlinked Data D 3.2.1 NLP2RDF + NIF • LOD2 Event . 06.09.2010 . 12 Page 12 http://lod2.eu
- 13. Creating Knowledge out of Interlinked Data D 3.2.1 NLP2RDF + NIF • Due End of April • Iterations: Design and Implementations followed by Feedback • All information on http://aksw.org/Projects/NIF • First Round (NIF Web Services): • OpenCalais • DBpedia Spotlight • Gate • Stanford Parser (POS Tags) • Lemmatizer LOD2 Event . 06.09.2010 . 13 Page 13 http://lod2.eu
- 14. Creating Knowledge out of Interlinked Data Thank you for your attention! LOD2 Presentation . 02.09.2010 . Page http://lod2.eu