Lecture at the IT University, Gothenburg 22 Nov 2012

1. Linked (Open) Data
IT University, Göteborg
Kerstin Forsberg
AstraZeneca, R&D Information
kerstin.l.forsberg@astrazeneca.com
kerfors on Twitter, Google+, LinkedIn, Slideshare, Blogspot, citulike

2. What is this?
 DBpedia
 WikiData
 Schema.org

3. Some headlines
 How DBpedia treats Wikipedia as a Database
 Wikipedia’s Next Big Thing: Wikidata, A Machine-
Readable, User-Editable Database Funded By
Google, Paul Allen And Others
 Google, Bing, Yahoo Start Schema.org for Content
Markup

4. Linked Open Data cloud
Richard Cyganiak and Anja Jentzsch
http://lod-cloud.net/
Growing Linked Open Data Cloud
http://youtu.be/TXFYSWuEOOw

5. Linking Open Data (LOD) cloud
http://data.gov.uk/ http://data.gov/
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6. Web of Documents
Web 3.0
Web of (Linked) Data An Intro To The Semantic Web: Why You Need To Know
About It Sooner Than Later , by Samantha Wong
Image Source: Frederic Martin

7. Global ID:s (URI:s)
 http://dbpedia.org/resource/IT_University
 http://dbpedia.org/resource/Gothenburg
 http://schema.org/CollegeOrUniversity
 http://education.data.gov.uk/id/school/123065
 http://research.data.astrazeneca.com/id/clinicalstudy/D5890C00003
 http://linkedct.org/resource/trial/nct00244608/
 http://spending.lichfielddc.gov.uk/spend/8605670
 http://reference.data.gov.uk/def/payment#netAmount

8. Opportunities
 Data organized for associations.
 Data prepared for not yet defined use.
 Data ready for automation where computers can
function alongside us to:
 Mitigate the complexity in discovering, accessing,
connecting and interpreting information.
 Improve the productivity in managing
information.

9. Semantic Web Standard Stack

10. RDF Triples
 Resource Description Framework (RDF)
A general model of how any piece of data, and
representations of knowledge, can be expressed as
so called triples.
subject predicate object (or value)
Stockholm type place
Stockholm capital Sweden
Stockholm subject Port cities in Sweden
Stockholm areaCode “+46-8”
“http://en.wikipedia.org/wiki/Stockholm”
Stockholm primaryTopic

11. RDF Triples
 Triples can be aggregated into graphs with subject
and objects as nodes, and predicates as arcs.
type City
capital Sweden
Stockholm subject Port cities in Sweden
areaCode “+46-8”
“http://en.wikipedia.org/wiki/Stockholm”
primaryTopic

12. RDF Triples
 Graphs of triples can be extended across different
sources and for different purpose.
type City
type Country
CDISC
capital Sweden
Stockholm subject Port cities in Sweden subject
CDISC
Interchange
EU 2012 areaCode “+46-8” Gothenburg
“http://en.wikipedia.org/wiki/Stockholm”
primaryTopic
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13. RDF Triples
 RDF Schema and the RDF based Web Ontology
Language (OWL) add a typing mechanism to
classify subjects and objects into hierarchies.
Thing subClass Place
subClass
subClass
Organization Event
Adm.Area
subClass
subClass
type subClass
Business
type City
Event type Country
CDISC
capital Sweden
type
Stockholm subject Port cities in Sweden subject
CDISC
Interchange
EU 2012 areaCode “+46-8” Gothenburg
“http://en.wikipedia.org/wiki/Stockholm”
primaryTopic

14. RDF Triples
 Google, Bing (Microsoft) and Yahoo use OWL
publish a joint vocabulary.
Thing subClass Place
subClass
subClass
Organization Event
Adm.Area
subClass
subClass
subClass
Business
City
Event Country
Exempel
http://schema.org/City

15. 4 Principles for Linked Data …
… and 5 stars for Linked Open Data
• Use URIs (Uniform Resource Identifiers) as
names for things.
• Use HTTP URIs so that people can look up
(dereference) those names.
• When someone looks up a URI, provide
useful information.
• Include links to other URIs so that they can
discover more things.
Source: Linked Open Data star scheme by example
More resources introducing and describing the Linked Data idea

16. Linked Enterprise Data
Source: What does Open Data mean for Enterprises?
More resources introducing and describing the Linked Data idea

17. I’m encouraged by …
• … what actually can be done by applying Linked
Data principles, together with a stepwise
implementation and pragmatic application of
crucial building blocks, to …
Health Care and Life Sciences (HCLS)
Interest Group
• … improve the research and commercial Linking Open Drug Data
utility of information
• Organized for associations
• Prepared for not yet defined use EU project The Large Knowledge Collider
Linked Life Data
• Ready for automation where computers can
function alongside us to A 2-page summary of our learnings from
participating in these external projects:
 Mitigate the complexity in discovering, Linked Data in Pharma, 2011, Bo Andersson
and Kerstin Forsberg
accessing, connecting and interpreting
information
 Improve the productivity in managing
information