After install rdf gem i got error:
NameError: uninitialized contstant RDF
Sounds like you probably need to require RubyGems before you require RDF.rb:
puts RDF::Statement(RDF::URI("http://rubygems.org/gems/rdf"), RDF::DC.title, "RDF.rb").inspect
Usually people set up an environment variable that automatically requires RubyGems for all their Ruby code:
$ export RUBYOPT="-rubygems"
Hope this helps...
thanks, it's very helpfull