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The Web pages for RubyRDF don't mention the debian package, downloadable bundle, integration of parser (which needs license info adding), etc.
This might help: I've made a Wiki page for quick note taking, since fiddling with the HTML pages for RubyRDF seems to be more of a hassle. That's no excuse for having out of date documentation, of course... http://esw.w3.org/t/view/ESW/RubyRDF