what can linked data do for digital libraries

What can Linked Data do for Digital Libraries?

Sören Auer

What is Linked Data?

Creating Knowledge out of Interlinked Data

Web server

Web server

Problem: Try to search for these things on the current Web:

• Apartments near German-English bilingual childcare in Berlin

• ERP service providers with offices in Vienna and London

• Researchers working on Digital Library topics in Eastern Europe

Information is available on the Web, but opaque to current search.

Why do we need the Data Web?

passau.deHas everything about childcare in Passau.

Immobilienscout.deKnows all about real estate offers in GermanyDB

Web server

DB

Web server

Search engineHTML HTML

RDF RDF

Solution: complement text on Web pages with structured linked open data & intelligently combine/integrate/join such structured information from different sources:

Creating Knowledge out of Interlinked Data 1. Uses RDF Data Model

Linked Data in a Nutshell

TPDL2013

Valetta

24.9.2013

Uni Maltaorganizes

starts

takesPlaceIn

2. Is serialised in triples:Uni_Malta organizes TPDL2013 .TPDL2013 starts “20130924”^^xsd:date .TPDL2013 takesPlaceAt Valetta .

3. Uses Content-negotiation

Subject Predicate Object

The emerging Web of Data

20082007

20082008

20082009

2009

2010

Linking Open Data cloud diagram, by Richard Cyganiak and Anja Jentzsch. http://lod-cloud.net/


Inter-linking/ Fusing

Classifi-cation/

Enrichment

Quality Analysis

Evolution / Repair

Search/ Browsing/

Exploration

Extraction

Storage/ Querying

Manual revision/ authoring

Linked DataLifecycle


Extraction

Inter-linking

Enrichment

Quality Analysis

Evolution Repair

Explora-tion

Extrac-tion

Store Query

Authoring


Storage and Querying

Inter-linking

Enrichment

Quality Analysis

Evolution Repair

Explora-tion

Extrac-tion

Store Query

Authoring


Authoring

Inter-linking

Enrichment

Quality Analysis

Evolution Repair

Explora-tion

Extrac-tion

Store Query

Authoring


© CC-BY-NC-ND by ~Dezz~ (residae on flickr)

Linking

Inter-linking

Enrichment

Quality Analysis

Evolution Repair

Explora-tion

Extrac-tion

Store Query

Authoring


Enrichment

Inter-linking

Enrichment

Quality Analysis

Evolution Repair

Explora-tion

Extrac-tion

Store Query

Authoring


Analysis

Quality

Inter-linking

Enrichment

Quality Analysis

Evolution Repair

Explora-tion

Extrac-tion

Store Query

Authoring


Evolution

© CC-BY-SA by alasis on flickr)

Inter-linking

Enrichment

Quality Analysis

Evolution Repair

Explora-tion

Extrac-tion

Store Query

Authoring


Exploration

Inter-linking

Enrichment

Quality Analysis

Evolution Repair

Explora-tion

Extrac-tion

Store Query

Authoring


Virtuoso RDF Store(conductor,

sparql, isparql, ods)

Virtuososponger

lod2webapi

RDFAuthor

Limes

ORE

D2RSemantic

Spatial Browser

sparqlproxy

SigmaEE

OntoWiki

LOD open refine

Silk-latc

stanbol

valiant

Dbpedia Spotlight

SPARQLed

PoolParty

Sieve

PoolParty Extractor


Classifi-cation/

Enrichment

Quality Analysis

Evolution /

RepairSearch/ Browsin

g/ Explorati

on

Extraction

Storage/ Queryin

g

Manual revision/ authorin

g

dl-learner

CubeViz

LOD2 demonstrator

R2R

rdf-dataset-integration

Silk

SIREn

Sparqlify

CSVImport

Dbpedia Spotlight UI

CKAN (source)

Mondeca Sparql Endpoint Status

Sindice(source)

Web Linkage Validator

Dbpedia (source)

LOD2 Stack Components

lodms

LOD2 stat. Workbench

LOD2 Authentication Component

Data Cube Validation Tool

Data Cube Merging Tool

Data Cube Slicing Tool

LOD2 Provenance Component

What is a Digital Library?


Search for stuff…

In a library I can …

© dfulmer

http://www.flickr.com/photos/annarbor/


Look at stuff…

In a library I can …

© ~Brenda-Starr~

http://www.flickr.com/photos/brenda-starr/


Search for stuff…

In a Digital Library I can …


Look at stuff…

In a Digital Library I can …


Two definitions:

• Online access to digitized/digital

artefacts (articles, books, manuscripts,

photographs,…)

• Digital Knowledge Hubs

new ways of sharing knowledge online

Digital Libraries


In our digital world with completely new

technology (internet, crowd-sourcing, linked

data) and devices (ultrabooks, smart

TVs/phones, tablets) ist not sufficient to just

„digitize“ the concept of a library.

We must re-invent the digital library as a

place for knowledge sharing on the Web.

Hypothesis


How can we re-invent the Library online?

We need new ingredients

© dhaun

http://www.flickr.com/photos/dhaun/


Think about new types of artefacts

• Thesauri, ontologies / knowledge bases

• Courseware / learning objects

• Data / knowledge assets

• Semantic descriptions

of the content of

publications

• …

How can we reinvent the Library online?


Think about new types of collaboration

and interaction

• Crowd-sourcing

• Social networking

• Serious games

• …



Think about new

technologies

• Semantic Web /

Linked Data

• Wikis

• Mashups

• Mobile Apps

• …



How can we reinvent the Library online?Mixing & mashing the ingridiens

• Thesauri, ontologies / knowledge bases• Courseware / learning objects• Knowledge assetts• Semantic descriptions of publications• …

Artefacts

• Crowd-sourcing• Social networking• Serious games• …

Collaboration & interaction

• Semantic Web / Linked Data• Wikis• Mashups• Mobile Apps• …

New technologies

Photo © sylvar

http://www.flickr.com/photos/sylvar/


1. OntoWiki – a semantic data wiki

2. Cortex – a semantic digital library

search backend

3. SlideWiki – a platform for crowd-

sourcing multilingual OpenCourseWare

4. SemanticPapers – capturing the

meaning of scientific publications

Are these digital libraries?


OntoWiki – a semantic data wiki


1. Semantic (Text)

Wikis

• Authoring of

semantically

annotated texts

2. Semantic Data

Wikis

• Direct authoring of

structured information

(i.e. RDF, RDF-

Schema, OWL)

Two Kinds of Semantic Wikis

Ont

oWik

iDynamic views on knowledge bases

OntoWiki for the Catalogus Professorum Lipsiensis

RDF triples on resource details page

Dynamic suggestions from the Data Web

OntoWiki for the Catalogus Professorum Lipsiensis

CPM Ontologie

Catalogus Professorum Lipsiensis

Cortex – a semantic digital library search backend


Cortex – Flexible und zukunftsfähige Architektur

Import Manager

Search Manager

License Manager

Availability Manager

Rest API

ARCHIV INDEX

BMS DICT DS

DS

CMS / User managementPresentation

Import


CORTEX Performance

Metric Description Performance

Queries per Second (qps)

Number of search request, which can be processed per second

2000

Search response time Maximum response time (till 100.000.000 objects and 2000 qps)

< 100 ms

Number of Objects Number of objects (resources), for which CORTEX was developed and tested

100.000.000


Try it out – www.ddb.de

Jochen Schon 39

SlideWiki – a platform for crowd-sourcing multilingual OpenCourseWare


How is SlideWiki different?

There are a number of online tools for presentations, such as Google

Docs Presentations, Prezi, SlideShare. SlideWiki differs quite a lot

from these due to its focus on:

E-learning - you can add questions to slides and thus compose

comprehensive self-assessment tests for learners

Collaboration - SlideWiki aims at empowering whole communities

to create presentations collaboratively

Translation - with SlideWiki content can be easily translated in

more than 50 languages

No other tool provides this twist and thus SlideWiki offers a unique

feature set.


Researchers spend a lot of time in

• encoding information in text

• Decoding information from text

Can we make this more efficient?

Semantic Publications


Researchers publish their findings in

structured form (e.g. encoded in a RDF

knowledge base)

This would enormously simplify:

• Finding related work

• Creating a survey

• Assessing a contribution

• …

Vision of scientific publishing


limes-paper describes appr123appr123 a approachappr123 for Link_Discoveryappr123 hasProp looseless...

limes-paper describes impl123impl123 a implementationimpl123 implements appr123impl123 language Java...

limes-paper describes eval123eval123 a evaluationeval123 evaluates impl123eval123 uses DBpedia...

Semantically describing the content of scientific publications


Classifi-cation/

Enrichment

Quality Analysis

Evolution / Repair

Search/ Browsing/

Exploration

Extraction

Storage/ Querying

Manual revision/ authoring

DigitalLibraries in the

Linked DataLifecycle

Hosting & maintenance of exploration tools

Be the “lighthouse” for the LOD ocean.

Library data is valuable background knowledge for KB enrichment & repair.

becoming linking hubs for the Data Web

support facilities for knowledge based authoring & collaboration

Provide storage facilities for Linked Data

Extract and publish structured (meta-) data for library content

Authorative Linked Data for quality assessment


• Digital libraries must support new

types of structured artefacts,

interaction & collaboration paradigms

and technologies

• The Linked Data paradigm helps to

connect knowledge from distributed

heterogeneous sources.

Wrap-up

EU-FP7 LOD2 Project Overview .

http://lod2.eu


AKSW Team

EU-FP7 LOD2 Project Overview .

http://lod2.eu


The LOD2 Gang


Thanks for your attention!

Sören Auerhttp://www.iai.uni-bonn.de/~auer | http://aksw.org | http://[email protected]

http://www.iai.uni-bonn.de/~auer



http://aksw.org/

http://lod2.org/

what can linked data do for digital libraries

Technology

interlinked data search

interlinked data storage

interlinked data cc

interlinked data look

interlinked data think

interlinked data evolution

rdf data model linked

emerging web of data