I googled for ruby RDF libraries and found quite a few, but I'm not sure which 
one is the best.  I'm going to start work on an open source application that 
makes heavy use of RDF and I would like to be able to use Ruby. I could 
technically do it with rexml, which I already know how to use, but that might 
prove too daunting a task. I'm looking more for something built on top of rexml 
that is specific to handling RDF.  So which one is best?

-Scott