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Intro to Semantic Web

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Hitchhiker's guide to the semantic web
What? There is more to the web than what we know? But why? What is semantic web? Why do we need it? How does it look like? How do we use it? Where is this applicable? What does linked data got to do with it? Is this the future of web?

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Intro to Semantic Web

  1. 1. Timea Turdean 15/03/2015
  2. 2. History of the Web
  3. 3. History of the Web Web of Documents Web of Data
  4. 4. "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
  5. 5. 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?
  6. 6. 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>
  7. 7. 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)
  8. 8. 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
  9. 9. 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>
  10. 10. Principles of Semantic Web 4. Classes are represented in Schemas and Ontologies
  11. 11. 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>
  12. 12. Principles of Semantic Web 5. Information about a resource is distributed on the Semantic Web and can be used/linked through Linked Data
  13. 13. Linked Open Data
  14. 14. Linked Open Data in 2014
  15. 15. SPARQL What are the countries and their capitals in Africa?
  16. 16. 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
  17. 17. Examples ● Semantic search - Reegle.info ● A music repository and mashup – BBC.co.uk/music ● Google uses Knowledge Graphs – Google.com
  18. 18. "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...
  19. 19. 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
  20. 20. 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
  21. 21. What is the conclusion? The Semantic Web is growing and linked open data is the future
  22. 22. Thank you for your attention Timea Turdean 15/03/2015

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