introduction to lod
DESCRIPTION
BUD cursus demonstratie collegeTRANSCRIPT
Introduction to Linked Data
Victor de Boer
Demonstratiecollege BUD 6-11-2013
Course setup
LD principles + practice
- Introduction to Linked Data- Building blocks of Linked Data- Simple Hands-on
LD principles + practice
- Serving Linked Open Data- SPARQL- Hands-on: ClioPatria
LD principles + practice
- Linking your data- Consuming Linked Data- Hands-on: Finalizing your LD
Internet, WWW, Linked Data?
• Internet
• World Wide Web
• Linked Data/Semantic Web
Source: “Games Aktuell Blog”, http://www.gamesaktuell.de/Community/MySite/GenX3601966-2605282/Blogs/Cyberpunks-beim-Mauerfall-694794/
Internet, WWW, Linked Data?
• Internet– 1970s– Network of linked computers – Protocols for communication
(TCP/IP)– Multiple applications
• World Wide Web
• Linked Data/Semantic Web
Tim Berners-Lee (aka Sir Tim aka TBL)
Invented the Web in 1989
Wrote the HTTP Protocol
Wrote HTML language
Wrote the first browser
Web of Documents (WWW)Linked Documents
Internet, WWW, Linked Data?
• Internet– 1970s– Network of linked computers – Protocols for communication
(TCP/IP)– Multiple applications
• World Wide Web– 1989 Tim Berners-Lee– Application on top of Internet– Hyperlinked documents– Protocols for communication
(HTTP)– Markup languages (HTML)– Browsers
• Linked Data/Semantic Web
Documents hard to read for machines ?
Web of DataLinked DataSemantic Web
Tim Berners-Lee (aka Sir Tim aka TBL)
Invented the Web in 1989
Wrote the HTTP Protocol
Wrote HTML language
Wrote the first browser
Wrote 2001 Scientific American paper “The Semantic Web” (with Ora Lasilla and Jim Hendler)
Internet, WWW, Linked Data?
• Internet– 1970s– Network of linked computers – Protocols for communication
(TCP/IP)– Multiple applications
• World Wide Web– 1989 Tim Berners-Lee– Application on top of Internet– Hyperlinked documents– Protocols for communication
(HTTP)– Markup languages (HTML)– Browsers
• Linked Data/Semantic Web– 2001 Tim Berners-Lee– Application on top of Internet, – Smart Web of hyperlinked data,
information and knowledge– Standards / languages for
representing data, information, knowledge (RDF, OWL)
– Since 2007 “Linked Data”
Wat is Linked Open DataOpen data is about licensingLinked Data is about interoperabilityLinked Open Data combines the two
``a term used to describe a recommended best practice for exposing, sharing, and connecting pieces of data, information, and knowledge on the Semantic Web using URIs and RDF.’’ --Wikipedia
``Sharable, spreadable and nerd-friendly’’-- Charlotte S H Jensen, kulturweb
★ Available on the web (whatever format), but with an open license
★★Available as machine-readable structured data (e.g. excel instead of image scan of a table)
★★★ as (2) plus non-proprietary format (e.g. CSV instead of excel)
★★★★
All the above plus, Use open standards from W3C (RDF and SPARQL) to identify things, so that people can point at your stuff
★★★★★All the above, plus: Link your data to other people’s data to provide context
www.w3.org/designissues/linkeddata.html
Linked Open Data five star system
May 2007
Linked Data Cloud Diagram
Oct 2007
“Linking Open Data cloud diagram, by Richard Cyganiak and Anja Jentzsch. http://lod-cloud.net/”
“Linking Open Data cloud diagram, by Richard Cyganiak and Anja Jentzsch. http://lod-cloud.net/”
Examples of Linked Data
• Academia, Research• Community• Libraries, Museums, Cultural Heritage• Government and public institutions
(Open Data)• Media• Business
How does all this work?
• Data, not documents• Structured data• Graph data!• W3C Web standards stack
– URIs, HTTP, RDF, RDFa, RDFS, OWL, SPARQL, etc
Resource Description Framework(RDF) triples
name
vdeboer
“Victor de Boer”
Subject Predicate Objectvdeboer naam “Victor de Boer”
RDF triples
student_in
BKO_cursus
name
vdeboer
“Victor de Boer”
Subject Predicate Objectvdeboer naam “Victor de Boer”vdeboer student_in BKO_cursus
RDF Graph
name
student_in
typetype
email naam
Person
H_Glasbeek
BKO_cursus
[email protected] Glasbeek
BKO Cursus @nl
name
vdeboer
“Victor de Boer”
name BKO Course@en
teaches
Interoperability
name
student_in
typetype
email naam
Person
H_Glasbeek
BKO_cursus
Hester Glasbeek
BKO Cursus @nl
name
vdeboer
“Victor de Boer”
nameBKO
Course@en
Hands-on Session 1
• 15 mins
• Introduce yourselves to each other!
• Draw a social RDF graph of your group– Represent each member of the group– Give everyone a name– You know each other now, so you can connect to each other in
the graph– Add other data about yourselves:
• Hometown• University• Things you like (e.g., music, films, …)