Some links to study

I'm researching on making a ranker today. Here's something I found interesting although not directly related to ranking. I am thinking of somehow parsing RDF... There must be a tool for it so my quest to search it goes on. http://tatsuyaoiw.hatenablog.com/entry/2012/07/12/170546 To Download later: http://rdf.dmoz.org/rdf/content.rdf.u8.gz