gistfile1.rb

require 'nokogiri'

doc = Nokogiri::XML open 'oval-definitions-2010.xml'

doc.css('definition[class="vulnerability"]').collect do |v|
  references = v.css('reference').collect {|v| v['ref_id']}.grep /^CVE/
  final_criteria = v.css('criterion[test_ref]').collect {|c| c['test_ref']}
  next Hash[
    final_criteria.collect{|c| doc.css "*[id='#{c}']"}.collect do |t|
      obj_ref_nodes = t.css('*[object_ref]')
      next unless obj_ref_nodes.first
      obj_ref = obj_ref_nodes.first['object_ref']
      state_ref_nodes = t.css('*[state_ref]')
      next unless state_ref_nodes.first
      state_ref = state_ref_nodes.first['state_ref']
      obj   = doc.css("*[id='#{obj_ref}']").first
      state = doc.css("*[id='#{state_ref}']").first
      next unless obj.name == 'dpkginfo_object'
      next [obj.content.strip, state.content.strip]
    end
  end]
end