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  • 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

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