linked data

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DBpedia is a community effort to extract structured information from Wikipedia and to make this information available on the Web.

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http://linkeddata.org/

Linked Data | Linked Data - Connect Distributed Data across the Web

Linked Data is about using the Web to connect related data that wasn't previously linked, or using the Web to lower the barriers to linking data currently linked using other methods.
http://publishing-statistical-data.googlecode.com/svn/trunk/specs/src/main/html/cube.html Abstract There are many situations where it would be useful to be able to publish multi-dimensional data, such as statistics, on the web in such a way that it can be linked to related data sets and concepts. The Data Cube vocabulary provides a means to do this using the W3C RDF (Resource Description Framework) standard.

The RDF Data Cube vocabulary