Quick Introduction to the Semantic Web, RDFa & Microformats

Semantic Web, RDFa & Microformats Tim Dennis Research Technologist Data Lab Emerging Tech Lightning Talks UC Berkeley Library

“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)

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. http://www.w3.org/DesignIssues/LinkedData.html

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. http://www.w3.org/DesignIssues/LinkedData.html

FOAF RDF Example: http://www.w3schools.com/rdf/rdf_example.asp

Linked Data: http://linkeddata.org/

http://id.loc.gov/authorities/

RDFa & Micoformats
Embeds semantics into existing XHTML
Annotates XHTML web pages with RDF (RDFa)
Mix of human readable & machine readable
RFDa uses CURIE – a way to prefix an inline namespace (amazonisbn: 0596153813)
More large services are publishing Microformats (been around longer) – linkedin, digg

Microformats
Events information - hCalendar.
People or organisations - hCard.
Geocode - Geo.
Copyright license - rel=license.
Social networking data - XFN
Tagging - rel=tag or xFolk.
Lists - XOXO.
Reviews - hReview.
http://microformats.org/

RFDa Vocabularies
Geo
FOAF
Dublin core
RDF Calendar
Beer & Wine Ontology
Resume
Many many more at schemaweb.info
RDFa Primer: http://www.w3.org/TR/xhtml-rdfa-primer/

Google Rich Snippets Microformats & RFDa
Reviews
People
Products
Businesses and organizations

Yahoo! SearchMonkey Accepted RDFa Vocabulary (you can also define own)
Dublin Core Document metadata
Friend-Of-A-Friend Personal profiles and social networks
VCard Personal and business addresses
VCalendar Events and other calendar items
hReview Reviews
SIOC Blogs, discussion forums, Q&A sites
GoodRelations Product price specification, delivery and payment etc.
DBPedia Generic vocabulary
Freebase Generic vocabulary

Yahoo! Search results Google search results RDFa & Microformat Enhanced Search Results RDFa Review Markup Microformat hReview Markup

MIT's Simile Exhibit – Structured data web publishing tool. Can consume RDF. Example below is of the timeline widget. < http://www.simile-widgets.org/exhibit/ > Music Composer Database: http://www.musicedmagic.com/Exhibit/composers.html

Simile Exhibit – Faceted view of structured data. < http://simile-widgets.org/exhibit/examples/nobelists/nobelists.html>

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Quick Introduction to the Semantic Web, RDFa & Microformats

by UC Berkeley LibTech on Sep 03, 2009

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