Linked Data: Emblematic applications on Legacy Data in Libraries

Overview of Presentation

• Linked Data: Introduction– Evolution of Syntactic Web to Linked Web – Linked Data Working Principles

• Current Trends & Implementations• Linking Legacy Data– Annotating Text Data & Publishing Legacy Data as Linked Data

• Conclusion

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Evolution of Syntactic Web to Linked Web

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Linked Web

Semantic Web

Syntactic Web

Web of Documents,Human clickable hyperlinks, Web 1.0, Web 2.0,Content not well structuredCan’t ask expressive queriesCan’t process content within applications

Web of Data

Web 3.0Machine Processable & Understandable,Data sets Isolated, unconnected

Meaningful Links between related Data sets,Making Web like a single global database

Need for Linked Data

• To enhance re-usability, findability & visibility of our data• Publish structured data directly on the Web in addition to

classic HTML pages.• Different Approaches

– Microformats– Web APIs & Mashups

» APIs slice the Web into separate data silos– Linked Data

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Christian Bizer: How to Publish Linked Data on the Web - Introduction (10/27/2008)

The Web of Linked Data

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Use Semantic Web technologies topublish structured data on the Web,set links between data from one data source to data within other data sources

Linked Data Working Principles

• Use URIs as names for things.• Use URIs, so that people can look up those names.• When someone looks up a URI, provide useful information,

using the standards (RDF).• Include links to other URIs, so that they can discover more

things.Tim Berners-Lee 2007

http://www.w3.org/DesignIssues/LinkedData.html

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URIs to identify people & relationships

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http://drtc.isibang.ac.in/DRTC/students/sayon http://drtc.isibang.ac.in/DRTC/students/vikas

http://drtc.isibang.ac.in/DRTC/students/debashis

http://live.dbpedia.org/page/Bangalore

http://xmlns.com

/foaf/0.1/based_near

http://xmlns.com/foaf/0.1/knows

Implementation in OCLC Worldcat

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Facts about few others

Name Software Events ReasoningSPARQL

EndpointTriples

License

LCSHMarkLogic & 4Store

Yes Yes YesMore than

300 million

Open

Eurovoc Sesame No No Yes N/ANot

Open

Wordnet 3.0 3Store Yes Yes YesMore than 2 million

Open

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OpenRefine(ex-Google Refine)

•Free, open source tool used for Cleaning messy data & Linking it to data sets like Freebase,

DBpedia, Europeana etc.•Survey result of 2014 reflects Librarians as largest user base.

04/18/23 Image Source : http://en.wikipedia.org/wiki/File:Google-refine-logo.svg 10

Linked Media Framework

• Server application that bundles central Semantic Web technologies such as

LMF Core :Linked Data Server that allows to expose data following the Linked Data Principles.

LMF Modules :Used to extend the functionality of the Linked Media Server.

• LMF Usage Scenarios :Publishing Legacy Data as Linked Data, Building Semantic Search over Data

04/18/23 Image Source: http://semanticweb.org/wiki/File:Weis_mit_bunter_schrift.png 11

Hostel Library Records

04/18/23 Data Entry by :http://drtc.isibang.ac.in/DRTC/students 12

Reconciliation against DBpedia writer Ontology

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04/18/23 Editing RDF Skeleton Continued… 14

Configuring Triples

RDF Skeleton of the Project

04/18/23 Editing RDF Skeleton Continued… 15

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RDF/XML using OpenRefine & csv2rdf

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<rdf:Description rdf:about="http://localhost:8080/LMF/resource/author/1"><rdf:type rdf:resource="http://xmlns.com/foaf/0.1/person"/><foaf:name>Robert Silverberg</foaf:name><owl:sameAs

rdf:resource="http://dbpedia.org/resource/Robert_Silverberg"/></rdf:Description>

<rdf:Description rdf:about="http://localhost:8080/LMF/resource/book/1"><dc:title>Passengers (short story)</dc:title><owl:sameAs

rdf:resource="http://dbpedia.org/resource/Passengers_(short_story)"/></rdf:Description>

<rdf:Description rdf:about="http://localhost:8080/LMF/resource/author/1"> <dc:creator rdf:resource="http://localhost:8080/LMF/resource/book/1"/></rdf:Description>

<rdf:Description rdf:about="#entry00001">

<rdf:type rdf:resource="http://data-gov.tw.rpi.edu/2009/data-gov-twc.rdf#DataEntry"/>

<id1>1</id1> <authors>Robert Silverberg</authors>

<id2>1</id2> <book_title>Passengers (short story)</book_title>

<author_id>1</author_id>

<book_id>1</book_id>

</rdf:Description>

OpenRefine output csv2rdf output

Conclusion

• Linked Data converts the whole web into a single database• Designed for machines and humans.• Links between concept-concept and concept-and its description.• Encourages reuse, reduces repetition.• Enables to add more value to data over the network.

• People can more easily find library resources on the web.

• More creative applications based on library metadata

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Thank you