entry:NXentry
    instrument:NXinstrument
      detector:NXdetector
        two_theta
          @primary = 1
          @target = /entry/instrument/detector/two_theta
        counts
          @axes = two_theta
          @signal = 1
          @target = /entry/instrument/detector/counts
    data:NXdata
      two_theta --> /entry/instrument/detector/two_theta
      counts --> /entry/instrument/detector/counts