The document provides an overview of the history and principles of the Semantic Web and linked open data. It discusses how the Semantic Web aims to add meaning to information on the web by identifying things with URIs and linking related resources. The core components are RDF triples that describe resources and ontologies that define classes and properties. Linked open data publishes structured data on the web in ways that allow them to be interlinked and accessed via SPARQL queries. Examples demonstrate how semantic search and applications are using these techniques.

1. Timea Turdean
15/03/2015

2. History of the Web

4. History of the Web
Web of
Documents
Web of
Data

5. "The Semantic Web is an extension
of the current web in which information
is given well-defined meaning,
better enabling computers and
people to work in cooperation."
Sir Tim Berners-Lee

6. Semantic Web
Why do we need semantic web?
Why is our current web not enough?
How do I find the right information?
What is important, what is not?
Is the information I got complete?
Can the search be reliable?
Can I really trust the information I found?

7. Semantic Web
The smallest unit of the Semantic Web is a TRIPLE
Java IslandIS AN
<SUBJECT PREDICATE OBJECT>
<http://dbpedia.org/resource/Java>
<http://example.org/isAn>
<http://dbpedia.org/resource/Island>
<?s ?p ?o>

8. Principles of Semantic Web
1. Each resource has a Unique Resource Identifier (URI)
JavaJava
http://dbpedia.org/resource/Java
http://dbpedia.org/resource/Java_(programming_language)

9. Principles of Semantic Web
2. We use resources and not just strings. In this way a resource
can belong to certain classes. Classes can have properties
sam
eAs
sameAs
http://ja.dbpedia.org/resource/ジャワ島
http://it.dbpedia.org/resource/Giava
http://dbpedia.org/resource/Java

10. Principles of Semantic Web
3. Classes, properties and resources are described through the
Resource Decription Framework (RDF)
<http://dbpedia.org/resource/Java>
<http://example.org/isAn>
<http://dbpedia.org/resource/Island>
<http://dbpedia.org/resource/Java>
<http://dbpedia.org/resource/sameAs>
< http://ja.dbpedia.org/resource/ジャワ島>
<http://dbpedia.org/resource/Java>
<http://dbpedia.org/resource/sameAs>
<http://it.dbpedia.org/resource/Giava>

11. Principles of Semantic Web
4. Classes are represented in Schemas and Ontologies

12. Principles of Semantic Web
4. Classes are represented in Schemas and Ontologies
<?xml version="1.0"?>
<rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
xml:base="http://dbpedia.org/resource/Thing#">
<rdf:Description rdf:ID="Island">
<rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Class"/>
</rdf:Description>
<rdf:Description rdf:ID="Java">
<rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Class"/>
<rdfs:subClassOf rdf:resource="#Island"/>
</rdf:Description>
</rdf:RDF>

13. Principles of Semantic Web
5. Information about a resource is distributed on the Semantic
Web and can be used/linked through Linked Data

14. Linked Open Data

15. Linked Open Data in 2014

16. SPARQL
What are the countries and their capitals in Africa?

17. How to publish & link data?
Publish data
●
Put the raw data online
●
Organize it, so it can be found
●
Liscence it, so it can be reused
Make Web data accessible
●
Metadata inside webpages
●
Use standard open formats
●
Add a Web API (SPARQL endpoint)
Integrate with the Web
●
Identify things <http://dbpedia.org/resource/Java>
●
Link them together
●
Use RDF to publish data & models

19. Examples
● Semantic search - Reegle.info
● A music repository and mashup – BBC.co.uk/music
● Google uses Knowledge Graphs – Google.com

20. "The Semantic Web is an extension
of the current web in which information
is given well-defined meaning,
better enabling computers and
people to work in cooperation."
Sir Tim Berners-Lee
SummaryNow I
got it...

21. Read more...
● History of web - http://webfoundation.org/about/vision/history-of-the-web/
● Getting started with Semantic Web: http://semanticweb.org/wiki/Getting_started
● Basics of Semantic Web on W3C - http://www.w3.org/2001/sw/wiki/Main_Page
● Questions on semantic web - http://answers.semanticweb.com/
●
Other presentation -
https://www.slideshare.net/search/slideshow?searchfrom=header&q=semantic+web

22. References
● History of Web - http://blog.learnlets.com/?cat=10
●
WorlsWideWeb browser -
http://www.w3.org/People/Berners-Lee/WorldWideWeb.html
● Principles of Semantic Web – www.blog.semantic-web.at
● Semantic Web schema - http://wiki.infowiss.net/Semantic_Web
● LOD - http://data.dws.informatik.uni-mannheim.de/lodcloud/2014/ISWC-RDB/
● SPARQL - http://en.wikipedia.org/wiki/SPARQL
●
How to publish your data -
http://www.slideshare.net/ldodds/web-integrated-data
●
The answer to life univers and everything -
http://www.desktopwallpapers4.me/typography/is-the-answer-to-everything-15318/
● Clean energy - http://www.reegle.info/
● BBC music - BBC.co.uk/music
●
Google knowledge graph -
http://www.google.com/insidesearch/features/search/knowledge.html

23. What is the conclusion?
The Semantic Web is growing
and
linked open data
is the future

24. Thank you for your attention
Timea Turdean
15/03/2015