LOD2 Webinar . 29.11.2011 . Page 1 http://lod2.eu
Creating Knowledge out of Interlinked Data
LOD2 Webinar . 29.11.2011 . Page 2 http://lod2.eu
Creating Knowledge out of Interlinked Data
http://lod2.eu
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.
LOD2 Webinar . 29.11.2011 . Page 3 http://lod2.eu
Creating Knowledge out of Interlinked Data
http://lod2.eu
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.
LOD2 Webinar . 20.03.2012 . Page 4 http://lod2.eu
Creating Knowledge out of Interlinked Data
LIMES - Link Discovery Framework for Metric Spaces -
LOD2 Webinar . 20.03.2012 . Page 5 http://lod2.eu
Creating Knowledge out of Interlinked Data
LIMES in LOD2
Main Ideas
Technical Details
Using LIMES
The Geeky Approach
LIMES Interface
Assisted Linking
Overview
LOD2 Webinar . 20.03.2012 . Page 6 http://lod2.eu
Creating Knowledge out of Interlinked Data
Linked Data Lifecycle
Inter-linking/ Fusing
Classifi-cation/
Enrichment
Quality Analysis
Evolution / Repair
Search/ Browsing/
Exploration
Extraction
Storage/ Querying
Manual revision/ authoring
Linked Data
Lifecycle
LOD2 Webinar . 20.03.2012 . Page 7 http://lod2.eu
Creating Knowledge out of Interlinked Data
LOD2 Stack
LOD2 Services
Central LOD2 Services Distributed/Local LOD2 Components
LOD Cloud: Access interfaces:
LOD2 Stack UI components
LOD2 Stack APIs and components
Knowledge Storage Layer
Linked Data SPARQL DUMPS
Sindice
Sig.ma
Semantic Authoring
LOD Cloud hosted on OpenLink's Virtuoso Query and Browsing capability
GovData.eu eGovernment
Portal Interlinking API
SILK DXX
Knowledge Base Fusion API
SemMF WIQA
Triplify, D2R
Enrichment and Repair API
DL-Learner ORE
Multi-Domain Ontology
Exalead Web
Search
Enterprise Search
LOD2 STACK API Create
Structure Link Fuse
Browse & Structure
Knowledge Store API
Virtuoso + MonetDB
Wolters Kluwer Deutschland LOD2 applied to Media and Publishing
LIMES
LOD2 Webinar . 20.03.2012 . Page 8 http://lod2.eu
Creating Knowledge out of Interlinked Data
Characteristics
Very large data sets
Complex data sets
Problems
Runtime
Complex Specifications
Solutions
Time-efficient computation
Assistance during configuration
Machine learning for creating link specifications
Link Discovery
LOD2 Webinar . 20.03.2012 . Page 9 http://lod2.eu
Creating Knowledge out of Interlinked Data
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 specs
LIMES
LOD2 Webinar . 20.03.2012 . Page 10 http://lod2.eu
Creating Knowledge out of Interlinked Data
Architecture
Mac
hin
e L
ear
nin
g
LOD2 Webinar . 20.03.2012 . Page 11 http://lod2.eu
Creating Knowledge out of Interlinked Data
Workflow
LOD2 Webinar . 20.03.2012 . Page 12 http://lod2.eu
Creating Knowledge out of Interlinked Data
Workflow
Hybrid approach
Time-efficient mappers Rich grammar
LOD2 Webinar . 20.03.2012 . Page 13 http://lod2.eu
Creating Knowledge out of Interlinked Data
1. Metadata
2. Source and Target
3. Similarity Measure
4. Acceptance Conditions
5. Review Conditions
6. Execution Mode
7. Output Format
LIMES Link Specifications
LOD2 Webinar . 20.03.2012 . Page 14 http://lod2.eu
Creating Knowledge out of Interlinked Data
1. Metadata
2. Source and Target
3. Similarity Measure
4. Acceptance Conditions
5. Review Conditions
6. Execution Mode
7. Output Format
LIMES Link Specifications
LOD2 Webinar . 20.03.2012 . Page 15 http://lod2.eu
Creating Knowledge out of Interlinked Data
1. Metadata
2. Source and Target
3. Similarity Measure
4. Acceptance Conditions
5. Review Conditions
6. Execution Mode
7. Output Format
LIMES Link Specifications
LOD2 Webinar . 20.03.2012 . Page 16 http://lod2.eu
Creating Knowledge out of Interlinked Data
Preprocessing functions
Strings, numerical values
Data converters
Similarity Measures
String
Numerical values
LIMES Link Specifications
Trigram
label label
lowerCase
LOD2 Webinar . 20.03.2012 . Page 17 http://lod2.eu
Creating Knowledge out of Interlinked Data
Operators
Measure operators
Spec operators
LIMES Link Specifications
Trigram
label label
Trigram
label name
MAX
LOD2 Webinar . 20.03.2012 . Page 18 http://lod2.eu
Creating Knowledge out of Interlinked Data
Operators
Measure operators
Spec operators
LIMES Link Specifications
Trigram
label label
Trigram
label name
Filter Filter
OR
LOD2 Webinar . 20.03.2012 . Page 19 http://lod2.eu
Creating Knowledge out of Interlinked Data
1. Metadata
2. Source and Target
3. Similarity Measure
4. Acceptance Conditions
5. Review Conditions
6. Execution Mode
7. Output Format
LIMES Link Specifications
LOD2 Webinar . 20.03.2012 . Page 20 http://lod2.eu
Creating Knowledge out of Interlinked Data
Task: Link drugs
and ingredients
Source: Dailymed
Target: Drugbank
Features
Definition of source, target, measures
Using property chains for linking
Using preprocessing
Geeky approach: XML
LOD2 Webinar . 20.03.2012 . Page 21 http://lod2.eu
Creating Knowledge out of Interlinked Data
Task: Link drugs
across knowledge bases
Source: DBpedia
Target: Drugbank
Features
Definition of complex measures
LIMES Native Interface
LOD2 Webinar . 20.03.2012 . Page 22 http://lod2.eu
Creating Knowledge out of Interlinked Data
OR(trigram(x.rdfs:label, y.drugbank:genericName)|0.8,
trigram(x.rdfs:label, y.rdfs:label)|0.8)
LIMES Native Interface
Trigram
label label
Trigram
label genericName
Filter Filter
OR
LOD2 Webinar . 20.03.2012 . Page 23 http://lod2.eu
Creating Knowledge out of Interlinked Data
Task: Link diseases
across knowledge bases
Source: Diseasome
Target: Sider
Features
Assisted linking
Definition of complex measures
COLANUT
LOD2 Webinar . 20.03.2012 . Page 24 http://lod2.eu
Creating Knowledge out of Interlinked Data
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, Sren Auer und Konrad
Hffner: RAVEN -- Active Learning of Link Specifications. In: Proceedings
of OM@ISWC
Further Information
LOD2 Webinar . 29.11.2011 . Page 25 http://lod2.eu
Creating Knowledge out of Interlinked Data
Credits
Jingle Axel Ngonga
Coordination Thomas Thurner
Martin Kaltenbck
Moderation Martin Kaltenbck
Presented by Axel Ngonga
http://bis.uni-leipzig.de/AxelNgonga
ngonga@informatik.uni-leipzig.de
http://bis.uni-leipzig.de/AxelNgongahttp://bis.uni-leipzig.de/AxelNgongahttp://bis.uni-leipzig.de/AxelNgonga
LOD2 Webinar . 29.11.2011 . Page 26 http://lod2.eu
Creating Knowledge out of Interlinked Data
http://lod2.eu
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 impr
