Relationship between RDF, RDFa, Microformats and Microdata [...]

Very briefly:

Microformats A way to use html pages as both a human readable document and machine readable data, without repetition (e.g. sticking CSV in the head element).
RDF A data model designed for the web. Schemaless, uses URLs to name types and relations.
RDFa A way to encode (write) RDF in html, following the style of microformats (i.e. minimising repetition). Works by adding a few attributes to html.
Microdata An alternative to RDFa, using different attributes and a different data model. [<small>(Source)</small>](http://stackoverflow.com/questions/14307792/what-is-the-relationship-between-rdf-rdfa-microformats-and-microdata/14321016#14321016)

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