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

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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

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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

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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 improve to meet your expectations! Dont forget to register for our next webinar 24.04.2012 D2R (University of Leipzig)