LOD2 Webinar Series: LIMES

Creating Knowledge out of Interlinked DataLOD2 Webinar . 29.11.2011 . Page 1 http://lod2.eu

Creating Knowledge out of Interlinked Data LOD2 is a large-scale integrating project co-funded by the European Commission within the FP7 Information and Communication Technologies Work Programme. This 4-year project comprises leading Linked Open Data technology researchers, companies, and service providers. Coming from across 12 countries the partners are coordinated by the Agile Knowledge Engineering and Semantic Web Research Group at the University of Leipzig, Germany. LOD2 will integrate and syndicate Linked Data with existing large-scale applications. The project shows the benefits in the scenarios of Media and Publishing, Corporate Data intranets and eGovernment. http://lod2.euLOD2 Webinar . 29.11.2011 . Page 2 http://lod2.eu

Creating Knowledge out of Interlinked Data Once per month the LOD2 webinar series offer a free webinar about tools and services along the Linked Open Data Life Cycle. Stay with us and learn more about acquisition, editing, composing, connected applications – and finally publishing Linked Open Data. http://lod2.euLOD2 Webinar . 29.11.2011 . Page 3 http://lod2.eu

Creating Knowledge out of Interlinked Data LIMES - Link Discovery Framework for Metric Spaces -LOD2 Webinar . 20.03.2012 . Page 4 http://lod2.eu

Creating Knowledge out of Interlinked DataOverview• LIMES in LOD2• Main Ideas• Technical Details• Using LIMES – The „Geeky“ Approach – LIMES Interface – Assisted LinkingLOD2 Webinar . 20.03.2012 . Page 5 http://lod2.eu

Creating Knowledge out of Interlinked Data Inter- linking/ FusingLinked Data Lifecycle Manual Classifi- revision/ cation/ authoring Enrichment Storage/ Linked Data Quality Querying Lifecycle Analysis Evolution / Extraction Repair Search/ Browsing/ ExplorationLOD2 Webinar . 20.03.2012 . Page 6 http://lod2.eu

Creating Knowledge out of Interlinked Data LOD2 Services LOD2 Stack UI components Sindice Sig.ma Browse &LOD2 Stack Semantic Structure Authoring GovData.eu eGovernment LOD2 Stack APIs Portal and components Interlinking API Exalead Enterprise Search DXX LIMES SILK Web Search Enrichment and Repair API Multi-Domain Ontology DL-Learner ORE LOD2 STACK API Knowledge Base Fusion API Create Wolters Kluwer Deutschland Structure SemMF WIQA LOD2 applied to Media and Publishing Link Fuse Knowledge Store API LOD Cloud hosted on OpenLinks Virtuoso Query and Browsing capability Virtuoso + MonetDB LOD Cloud: Access interfaces: Knowledge Storage Layer Linked Data SPARQL DUMPS Triplify, D2R Central LOD2 Services Distributed/Local LOD2 ComponentsLOD2 Webinar . 20.03.2012 . Page 7 http://lod2.eu

Creating Knowledge out of Interlinked DataLink Discovery• Characteristics – Very large data sets – Complex data sets• Problems – Runtime – Complex Specifications• Solutions – Time-efficient computation – Assistance during configuration – Machine learning for creating link specificationsLOD2 Webinar . 20.03.2012 . Page 8 http://lod2.eu

Creating Knowledge out of Interlinked DataLIMES• Declarative Link Discovery Framework• Tuned towards efficiency and extensibility• Set-theoretical grammar for specifying links• Time-efficient mappers for single data types• Machine learning for detecting link specsLOD2 Webinar . 20.03.2012 . Page 9 http://lod2.eu

Creating Knowledge out of Interlinked DataArchitecture Machine LearningLOD2 Webinar . 20.03.2012 . Page 10 http://lod2.eu

Creating Knowledge out of Interlinked DataWorkflowLOD2 Webinar . 20.03.2012 . Page 11 http://lod2.eu

Creating Knowledge out of Interlinked Data Workflow Hybrid approach Time-efficientRich grammar mappers LOD2 Webinar . 20.03.2012 . Page 12 http://lod2.eu

Creating Knowledge out of Interlinked DataLIMES Link Specifications1. Metadata2. Source and Target3. Similarity Measure4. Acceptance Conditions5. Review Conditions6. Execution Mode7. Output FormatLOD2 Webinar . 20.03.2012 . Page 13 http://lod2.eu

Creating Knowledge out of Interlinked DataLIMES Link Specifications• Preprocessing functions – Strings, numerical values – Data converters• Similarity Measures Trigram – String – Numerical values lowerCase label labelLOD2 Webinar . 20.03.2012 . Page 16 http://lod2.eu

Creating Knowledge out of Interlinked DataLIMES Link Specifications• Operators – Measure operators – Spec operators MAX Trigram Trigram label label label nameLOD2 Webinar . 20.03.2012 . Page 17 http://lod2.eu

Creating Knowledge out of Interlinked DataLIMES Link Specifications• Operators – Measure operators OR – Spec operators Filter Filter Trigram Trigram label label label nameLOD2 Webinar . 20.03.2012 . Page 18 http://lod2.eu

Creating Knowledge out of Interlinked DataGeeky approach: XML• Task: Link drugs and ingredients – Source: Dailymed – Target: Drugbank – Features • Definition of source, target, measures • Using property chains for linking • Using preprocessingLOD2 Webinar . 20.03.2012 . Page 20 http://lod2.eu

Creating Knowledge out of Interlinked DataLIMES Native Interface• Task: Link drugs across knowledge bases – Source: DBpedia – Target: Drugbank – Features • Definition of complex measuresLOD2 Webinar . 20.03.2012 . Page 21 http://lod2.eu

Creating Knowledge out of Interlinked DataLIMES Native Interface• OR(trigram(x.rdfs:label, y.drugbank:genericName)|0.8, trigram(x.rdfs:label, y.rdfs:label)|0.8) OR Filter Filter Trigram Trigram label label label genericNameLOD2 Webinar . 20.03.2012 . Page 22 http://lod2.eu

Creating Knowledge out of Interlinked DataCOLANUT• Task: Link diseases across knowledge bases – Source: Diseasome – Target: Sider – Features • Assisted linking • Definition of complex measuresLOD2 Webinar . 20.03.2012 . Page 23 http://lod2.eu

Creating Knowledge out of Interlinked DataFurther Information• Technical Details – Requirements: Java 1.6 – License: http://creativecommons.org/licenses/ by-nc-sa/3.0/• Technical papers – Axel-Cyrille Ngonga Ngomo: A Time-Efficient Hybrid Approach to Link Discovery. In: Proceedings of the sixth international workshop on Ontology Matching, 2011 – Axel-Cyrille Ngonga Ngomo und Klaus Lyko: EAGLE: Efficient Active Learning of Link Specifications using Genetic Programming. In: Proceedings of ESWC 2012 – Axel-Cyrille Ngonga Ngomo, Jens Lehmann, Sören Auer und Konrad Höffner: RAVEN -- Active Learning of Link Specifications. In: Proceedings of OM@ISWCLOD2 Webinar . 20.03.2012 . Page 24 http://lod2.eu

Creating Knowledge out of Interlinked DataCreditsJingle Axel NgongaCoordination Thomas Thurner Martin KaltenböckModeration Martin KaltenböckPresented by Axel Ngonga http://bis.uni-leipzig.de/AxelNgonga ngonga@informatik.uni-leipzig.deLOD2 Webinar . 29.11.2011 . Page 25 http://lod2.eu

Creating Knowledge out of Interlinked Data Hope you enjoyed staying with us – if you need more detailed information, visit us at www.lod2.eu and let us know how we can improve to meet your expectations! Don’t forget to register for our next webinar 24.04.2012 – D2R (University of Leipzig) http://lod2.euLOD2 Webinar . 29.11.2011 . Page 26 http://lod2.eu

LOD2 Webinar Series: LIMES

by LOD2 Creating Knowledge out of Interlinked Data

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