# File lib/numru/nusdas.rb, line 186
    def close
      @meta.each{|t1,t1h|
        t1h.each{|t2,t2h|
          t2h.each{|t3,t3h|
            t3h.each{|bt,hash|
              hash[:files].each{|h|
                h[:file].close
              }
            }
          }
        }
      }
      @meta = nil
      return nil
    end