http://www.ibm.com/developerworks/cn/education/xml/x-sparql/section2.html
http://semwebtw.openfoundry.org/tutorial/SPARQL-for-developer-employers.xhtml
http://www.w3.org/TR/rdf-sparql-query/
SPARQL Query Language for RDF
For example, the following query returns names and emails of every person in the dataset:
[Note] foaf : friend of a friend
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