OpenHPI 1.7 - Applications in the Web of Data

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Free online Lecture "Semantic Web Technologies" at OpenHPI. Visit the Course website, registration is free. You will find the lecture recordings as mp3 and also as video at https://openhpi.de/course/semanticweb

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OpenHPI 1.7 - Applications in the Web of Data

  1. 1. Semantic Web Technologies Lecture 1: The Web of Data 07: Applications in the Web of Data Dr. Harald Sack Hasso Plattner Institute for IT Systems Engineering University of Potsdam Spring 2013This file is licensed under the Creative Commons Attribution-NonCommercial 3.0 (CC BY-NC 3.0)
  2. 2. 2 Lecture 1: The Web of Data Open HPI - Course: Semantic Web Technologies Semantic Web Technologies , Dr. Harald Sack, Hasso-Plattner-Institut, Universität Potsdam
  3. 3. 3 07: Applications in the Web of Data OpenHPI - Course Semantic Web Technologies - Lecture 1: The Web of Data Semantic Web Technologies , Dr. Harald Sack, Hasso-Plattner-Institut, Universität Potsdam
  4. 4. Semantic Web Technologies Applications on the Web of Data4 Linked Data □ Linked Open Data (LOD) denote publicly available (RDF) Data in the Web, identified via URI and accessable via HTTP. Linked data link to other data via URI. The ,Web of Data‘ • >31 billion facts • >500 million links (Oct. 2011) Semantic Web Technologies , Dr. Harald Sack, Hasso-Plattner-Institut, Universität Potsdam
  5. 5. 5 http://www.bbc.co.uk/music Semantic Web Technologies , Dr. Harald Sack, Hasso-Plattner-Institut, Universität Potsdam
  6. 6. What is so special about the BBC6 Music Website? • Information is dynamically aggregated from external, publicly available data (Wikipedia, MusicBrainz,...) • no Screen Scraping • no specialized API • data available als Linked Open Data • data access via simple HTTP Request • data is always up-to-date without manual interaction Semantic Web Technologies , Dr. Harald Sack, Hasso-Plattner-Institut, Universität Potsdam
  7. 7. Search Engines - Document Retrieval7 •Search Engine Query String: “Jaguar of 2000“ Semantic Web Technologies , Dr. Harald Sack, Hasso-Plattner-Institut, Universität Potsdam
  8. 8. Search Engines - Document Retrieval7 •Search Engine Query String: “Jaguar of 2000“ • Refine ,jaguar‘ CAR or ANIMAL or OPERATINGSYSTEM etc. ? Refine: CAR Semantic Web Technologies , Dr. Harald Sack, Hasso-Plattner-Institut, Universität Potsdam
  9. 9. Search Engines - Document Retrieval8 •Search Engine Query String: “Jaguar of 2000“ • Name: Jaguar E Type • Category: Car • ... • ConstructionYear <Integer> • technicalParameter • CylinderCapacity <Integer> • Power <Integer> • ... • ... Knowledge Representation (Ontology, Linked Data) Semantic Web Technologies , Dr. Harald Sack, Hasso-Plattner-Institut, Universität Potsdam
  10. 10. Search Engines - Document Retrieval8 •Search Engine Query String: “Jaguar of 2000“ • Name: Jaguar E Type • Category: Car • ... • ConstructionYear <Integer> • technicalParameter • CylinderCapacity <Integer> • Power <Integer> • ... • ... Knowledge Representation • Refine ,2000‘ (Ontology, Linked Data) ConstructionYear or technicalParameter ? Refine: ConstructionYear Semantic Web Technologies , Dr. Harald Sack, Hasso-Plattner-Institut, Universität Potsdam
  11. 11. Search Engines - Document Retrieval9 • General Problems: • correct interpretation of query string • correct identification of entities • automatic disambiguation • usability • personalization Semantic Web Technologies , Dr. Harald Sack, Hasso-Plattner-Institut, Universität Potsdam
  12. 12. Search Engines - Fact Retrieval10 •Query String: “Where can I fill up the tank at a considerable discount?“ Answer : - Hohenfelden, xy-Str. 32 -> Super leaded, 1,99 € - fuel-efficient route will be passed to navigation - drive only at half throttle for saving fuel… Semantic Web Technologies , Dr. Harald Sack, Hasso-Plattner-Institut, Universität Potsdam
  13. 13. Search Engines - Exploratory Search dbpedia:Michael_Collins11 dbpedia-owl:mission dbpedia:Apollo_11 dbpedia-owl:mission dcterms:subject dbpedia-owl:mission dbpedia:Neil_Armstrong dbpedia:Buzz_Aldrin dcterms:subject category:Apollo_program dbpedia:Apollo_13 rdf:type dbpedia:Space_Shuttle_Challenger yago:Space_accidents_and_incidents rdf:type Semantic Web Technologies , Dr. Harald Sack, Hasso-Plattner-Institut, Universität Potsdam
  14. 14. Intelligent Agents in the Semantic Web12 WWW User presentation service retrieval service (e.g. Firefox) (e.g. Google) WWW documents Semantic Web Technologies , Dr. Harald Sack, Hasso-Plattner-Institut, Universität Potsdam
  15. 15. Intelligent Agents in the Semantic Web12 WWW Semantic Web User User personal assistant intelligent infrastructure presentation service retrieval service services (e.g. Firefox) (e.g. Google) WWW documents WWW documents Semantic Web Technologies , Dr. Harald Sack, Hasso-Plattner-Institut, Universität Potsdam
  16. 16. 3 Generations of Web Documents13 static web pages HTML / CSS 1. Generation Semantic Web Technologies , Dr. Harald Sack, Hasso-Plattner-Institut, Universität Potsdam
  17. 17. 3 Generations of Web Documents13 interactive web pages static web pages JavaScript / Applets Data Base Access HTML / CSS Template-based Generation dynamic web pages 1. Generation 2. Generation Semantic Web Technologies , Dr. Harald Sack, Hasso-Plattner-Institut, Universität Potsdam
  18. 18. 3 Generations of Web Documents13 interactive virtual web pages web pages static Netbots web pages JavaScript / Applets Information Extraction Presentation Planning Data Base Access HTML / CSS User Models Template-based Machine Learning Generation Online Layout dynamic adaptive web pages web pages 1. Generation 2. Generation 3. Generation Semantic Web Technologies , Dr. Harald Sack, Hasso-Plattner-Institut, Universität Potsdam
  19. 19. 14 Toolbox for the Semantic Web • Standardized languages to express semantics of information content in the Web (XML/XSD, RDF(S), OWL, RIF) • Tools to use semantic information in the Web (RDFa, GRDDL, ...) • Various fields of computer science: • artificial intelligence • linguistics • computer architecture • cryptography • software engineering • data bases • systems theory • theoretical computer science • computer networks Semantic Web Technologies , Dr. Harald Sack, Hasso-Plattner-Institut, Universität Potsdam
  20. 20. Next Lect ure15 Lecture 2: Basic Architecture of the Semantic Web Semantic Web Technologies , Dr. Harald Sack, Hasso-Plattner-Institut, Universität Potsdam

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