I just released version 0.1.0 of the rdfa_parser_gem. This parser is written in Ruby and uses Nokogiri XML parsing. It passes all XHTML1 test cases and most of the existing test cases for HTML4 and HTML5.

The gem is based on previous work done by Ben Adida and some libraries borrowed from the Reddy Gem.

The project is hosted on GitHub, feel free to clone. You can try out the parser through a distiller.

2013 Update

This gem is now obsoleted by the RDF::RDFa and the distiller is now here