RDF is a general method to encoding metadata and other knowledge on
the Semantic Web, with some
rules about the semantics, or meaning, of those pieces. The
point is to have a method so simple that it can express any fact. It's not easy to understand completely. Read the following websites carefully and try to use it until you get used to it.
http://en.wikipedia.org/wiki/Resource_Description_Framework
https://drupal.org/project/rdf
https://drupal.org/module-categories/rdf
http://www.lullabot.com/blog/article/how-does-rdf-work-drupal-7
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