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Web 3.0 The Semantic Web

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Web 3.0 The Semantic Web

  1. Web 3.0 The Semantic Web Hatem Mahmoud Lead Developer, eSpace ExpressionLab.com
  2. Agenda Introduction The Problem Solutions Applications Summary
  3. Introduction
  4. Every language has its own Syntax and Semantics
  5. Syntax is the study of grammar
  6. Semantics is the study of meaning
  7. Syntax is how to say something
  8. Semantic is the meaning behind what you say
  9. Different syntaxes may have the same semantic: x += y x=x+y
  10. Syntax and semantics are all about communication
  11. Computers use network protocols to communicate in networks
  12. The Internet is a huge network of computers that use TCP/IP to communicate
  13. The Web is a system of interlinked documents accessed via the Internet
  14. Web browsers use HTTP to communicate with Web servers
  15. You can view Web pages and use hyperlinks to navigate between them
  16. People can easily access any of these documents
  17. This is the largest source of information ever
  18. This is Web 1.0
  19. Authors started to use Ajax
  20. People started to share photos and videos
  21. People started to interact in social networks
  22. People started to publish content in blogs
  23. People started to contribute in wikis
  24. People started to use tags and RSS
  25. This is the Read-Write Web
  26. This is Web 2.0
  27. The Problem
  28. Web pages are written in HTML
  29. HTML describes the structure of information
  30. HTML describes the syntax not the semantics
  31. If computers can understand the meaning behind information...
  32. they can learn what we are interested in
  33. they can help us better find what we want
  34. This is really what the Semantic Web is all about
  35. This is Web 3.0
  36. Today's Web is about documents
  37. The Semantic Web is about things
  38. It can recognize people, places, events, companies, products, movies, etc.
  39. It can understand the relationships between things
  40. Example?
  41. Solutions
  42. Solution: Top Down
  43. Information analysis, web scraping, natural language processing
  44. Expensive! human intervention, hard to maintain, legal issues
  45. Solution: Bottom Up
  46. Embedding semantical annotations into the data
  47. How?
  48. Available options: RDFa and microformats
  49. RDFa
  50. RDF is Resource Description Framework
  51. RDF is a W3C standard for describing resources in the Web
  52. RDF identifies things using URIs (Uniform Resource Identifiers)
  53. RDF uses simple statements (Triples) to describe things
  54. Thing-Property-Value Subject-Predicate-Object
  55. RDF graph representation
  56. RDF/XML
  57. N3 (Notation3)
  58. RDFa = RDF in attributes
  59. RDFa provides a set of XHTML attributes that express RDF data
  60. Example: Alice in Semantic Wonderland
  61. Alice is a blogger who publishes articles at http://example.com/alice
  62. She wants to declare the license of her work
  63. She wants to specify title and creator of an article
  64. But there are no such attributes in XHTML
  65. She can use Dublin Core vocabulary Dublin: Dublin, Ohio, USA Core: only the core elements of metadata
  66. She wants to give Bob proper credit when she posts his photos
  67. She wants to display her name, email and phone
  68. She can use Friend-of-a-Friend vocabulary
  69. She wants to list her friends
  70. SPARQL (SPARQL Protocol And RDF Query Language)
  71. SPARQL is a query language for RDF data
  72. You can search for "friends of Alice who created items whose title contains 'Bob'"
  73. microformats
  74. microformats are simple conventions for embedding semantics in HTML
  75. designed for humans first, and machines second
  76. No namespaces, No new tags
  77. Built upon existing standards vCard, iCalendar, Atom, etc.
  78. hCard (HTML vCard) represents people, companies, places and organizations
  79. hCalendar (HTML iCalendar) Represents calendar events
  80. hReview Represents reviews of products, services, businesses, events, etc.
  81. hResume represents resumes
  82. Applications
  83. YahooTech uses hReview for product reviews
  84. LinkedIn uses hResume for resumes
  85. YahooUpcoming uses hCal for events
  86. Challenges! tools, privacy, trust, applications, devices
  87. Summary
  88. “I have a dream for the Web in which computers become capable of analyzing all the data on the Web” Tim Berners-Lee, 1999 Inventor of the Web
  89. The Semantic Web is not a separate Web but an extension of the current one
  90. It is really happening today
  91. Resources
  92. Thank You! Hatem Mahmoud Lead Developer, eSpace ExpressionLab.com