def filelists
      fl = []
      @repomd.xpath("/xmlns:repomd/xmlns:data[@type=\"filelists\"]/xmlns:location").each do |f|
       fl << File.join(@url, f['href'])
      end
      fl
    end
def filelists
      fl = []
      @repomd.xpath("/xmlns:repomd/xmlns:data[@type=\"filelists\"]/xmlns:location").each do |f|
       fl << File.join(@url, f['href'])
      end
      fl
    end
Rasises exception if can't retrieve repomd.xml