There isn't any real consensus on what Web 3.0 is as of the spring of 2012.
Suggested key features are:
Search for Web 30
OWL Example with RDF Graph - Introduction to ontologies and semantic web - tutorial
Tutorial 4: Introducing RDFS & OWL
DCMI Home: Dublin Core® Metadata Initiative (DCMI)
Online Computer Library Center (OCLC) - Wikipedia
See examples of rdf files in the eBook system.
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