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Quick Introduction to the Semantic Web, RDFa & Microformats


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Google's recent announcement that it will support the use of microformats in their search opens up new possibilities for librarians and library technologists to support the goals of the semantic web; namely to provide better access, reuse and recombinations of library resources and services on the open web. This lightning talk introduces the semantic web and semantic markup technologies.

Published in: Education, Technology
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Quick Introduction to the Semantic Web, RDFa & Microformats

  1. 1. Semantic Web, RDFa & Microformats Tim Dennis Research Technologist Data Lab Emerging Tech Lightning Talks UC Berkeley Library
  2. 5. “The Semantic Web provides a common framework that allows data to be shared and reused across application, enterprise, and community boundaries” (World Wide Web Consortium, 2008a)
  3. 6. RDF 1. Resource Description Framework 2. Presents relationships in a simple data structure 3. We can draw graphs of those relationships 4. We can represent those relationships in multiple formats for computers --Tim Berners-Lee, Linked Data - Design Issues.
  4. 7. Design Principles 1. Use URIs for names of things 2. Use HTTP URIs so people can look up those names 3. Provide useful information in standard formats at those URIs 4. Include links to other URIs so people can discover more things --Tim Berners-Lee, Linked Data - Design Issues.
  5. 8. FOAF RDF Example:
  6. 9. Linked Data:
  7. 10.
  8. 11.
  9. 12. RDFa & Micoformats <ul><li>Embeds semantics into existing XHTML
  10. 13. Annotates XHTML web pages with RDF (RDFa)
  11. 14. Mix of human readable & machine readable
  12. 15. RFDa uses CURIE – a way to prefix an inline namespace (amazonisbn: 0596153813)
  13. 16. More large services are publishing Microformats (been around longer) – linkedin, digg </li></ul>
  14. 17. Microformats <ul><li>Events information - hCalendar.
  15. 18. People or organisations - hCard.
  16. 19. Geocode - Geo.
  17. 20. Copyright license - rel=license.
  18. 21. Social networking data - XFN
  19. 22. Tagging - rel=tag or xFolk.
  20. 23. Lists - XOXO.
  21. 24. Reviews - hReview. </li></ul>
  22. 25. RFDa Vocabularies <ul><li>Geo
  23. 26. FOAF
  24. 27. Dublin core
  25. 28. RDF Calendar
  26. 29. Beer & Wine Ontology
  27. 30. Resume
  28. 31. Many many more at </li></ul>RDFa Primer:
  29. 32. Google Rich Snippets Microformats & RFDa <ul><li>Reviews
  30. 33. People
  31. 34. Products
  32. 35. Businesses and organizations </li></ul>
  33. 36. Yahoo! SearchMonkey Accepted RDFa Vocabulary (you can also define own) <ul><li>Dublin Core Document metadata
  34. 37. Friend-Of-A-Friend Personal profiles and social networks
  35. 38. VCard Personal and business addresses
  36. 39. VCalendar Events and other calendar items
  37. 40. hReview Reviews
  38. 41. SIOC Blogs, discussion forums, Q&A sites
  39. 42. GoodRelations Product price specification, delivery and payment etc.
  40. 43. DBPedia Generic vocabulary
  41. 44. Freebase Generic vocabulary </li></ul>
  42. 45. Yahoo! Search results Google search results RDFa & Microformat Enhanced Search Results RDFa Review Markup Microformat hReview Markup
  43. 46. MIT's Simile Exhibit – Structured data web publishing tool. Can consume RDF. Example below is of the timeline widget. < > Music Composer Database:
  44. 47. Simile Exhibit – Faceted view of structured data. <>