>>> a=nxload('tstfile_00012.h5')
>>> print a.tree
root:NXroot
  @HDF5_version = 1.8.7
  @NX_class = NXroot
  @NeXus_version = 4.3.0
  @file_name = /home/p02user/ndts-data/tstfile_00012.h5
  @file_time = 2013-06-10T16:01:13.444118+0200
  @file_update_time = 2013-06-10T16:11:27.281809+0200
  NexusConfigurationLogs:
  entry:NXentry
    control:NXmonitor
      data = 1.0
        @type = NX_FLOAT
      mode = monitor
        @type = NX_CHAR
    data:NXdata
      data = uint64(2001)
        @nexdatas_source = <datasource type="CLIENT" name="eh1b_c01">      
      <record name="expchan/sis3820_eh1b/1"></record>      
     </datasource>
        @type = NX_UINT64
        @units = counts
      x = float64(2001)
        @nexdatas_source = <datasource type="CLIENT" name="polar_angle_channel_1">      
      <record name="polar_angle_channel_1"></record>      
     </datasource>
        @type = NX_FLOAT64
        @units = degrees
    end_time = 2013-06-10T16:11:27.255507+0200
      @nexdatas_source = <datasource type="CLIENT" name="end_time">    
    <record name="end_time"></record>    
    <doc>     The end time is provided by the client after the experiment is finished.    </doc>    
   </datasource>
      @type = NX_DATE_TIME
    experiment_identifier = 100234134
      @nexdatas_source = <datasource type="CLIENT" name="beamtime_id">    
    <record name="beamtime_id"></record>    
   </datasource>
      @type = NX_CHAR
    instrument:NXinstrument
      beamstop:NXbeam_stop
        description = circular
          @type = NX_CHAR
        distance_to_detector = -1.0
          @type = NX_FLOAT
          @units = mm
        size = -1.0
          @type = NX_FLOAT
          @units = mm
        status = out
          @type = NX_CHAR
        x = float64(2001)
          @nexdatas_source = <datasource type="TANGO" name="TG_eh1b_mot13">      
      <record name="Position"></record>      
      <device member="attribute" hostname="haspp02oh1" name="p02/motor/eh1b.13" port="10000"></device>      
     </datasource>
          @type = NX_FLOAT
          @units = mm
        y = float64(2001)
          @nexdatas_source = <datasource type="TANGO" name="TG_eh1b_mot06">      
      <record name="Position"></record>      
      <device member="attribute" hostname="haspp02oh1" name="p02/motor/eh1b.06" port="10000"></device>      
     </datasource>
          @type = NX_FLOAT
          @units = mm
      channel_1:NXdetector
        azimuthal_angle = 0.0
          @type = NX_FLOAT64
          @units = degrees
        count_time = uint64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="eh1b_c32">      
      <record name="expchan/sis3820_eh1b/32"></record>      
     </datasource>
          @type = NX_UINT64
          @units = microseconds
        data = uint64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="eh1b_c01">      
      <record name="expchan/sis3820_eh1b/1"></record>      
     </datasource>
          @type = NX_UINT64
          @units = counts
        diameter = 6.0
          @type = NX_FLOAT64
          @units = mm
        distance = 1.0
          @type = NX_FLOAT64
          @units = mm
        layout = point
          @type = NX_CHAR
        polar_angle = float64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="polar_angle_channel_1">      
      <record name="polar_angle_channel_1"></record>      
     </datasource>
          @type = NX_FLOAT64
          @units = degrees
      channel_10:NXdetector
        azimuthal_angle = 0.0
          @type = NX_FLOAT64
          @units = degrees
        count_time = uint64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="eh1b_c32">      
      <record name="expchan/sis3820_eh1b/32"></record>      
     </datasource>
          @type = NX_UINT64
          @units = microseconds
        data = uint64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="eh1b_c10">      
      <record name="expchan/sis3820_eh1b/10"></record>      
     </datasource>
          @type = NX_UINT64
          @units = counts
        diameter = 6.0
          @type = NX_FLOAT64
          @units = mm
        distance = 1.0
          @type = NX_FLOAT64
          @units = mm
        layout = point
          @type = NX_CHAR
        polar_angle = float64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="polar_angle_channel_1">      
      <record name="polar_angle_channel_1"></record>      
     </datasource>
          @type = NX_FLOAT64
          @units = degrees
      channel_2:NXdetector
        azimuthal_angle = 0.0
          @type = NX_FLOAT64
          @units = degrees
        count_time = uint64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="eh1b_c32">      
      <record name="expchan/sis3820_eh1b/32"></record>      
     </datasource>
          @type = NX_UINT64
          @units = microseconds
        data = uint64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="eh1b_c02">      
      <record name="expchan/sis3820_eh1b/2"></record>      
     </datasource>
          @type = NX_UINT64
          @units = counts
        diameter = 6.0
          @type = NX_FLOAT64
          @units = mm
        distance = 1.0
          @type = NX_FLOAT64
          @units = mm
        layout = point
          @type = NX_CHAR
        polar_angle = float64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="polar_angle_channel_2">      
      <record name="polar_angle_channel_2"></record>      
     </datasource>
          @type = NX_FLOAT64
          @units = degrees
      channel_3:NXdetector
        azimuthal_angle = 0.0
          @type = NX_FLOAT64
          @units = degrees
        count_time = uint64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="eh1b_c32">      
      <record name="expchan/sis3820_eh1b/32"></record>      
     </datasource>
          @type = NX_UINT64
          @units = microseconds
        data = uint64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="eh1b_c03">      
      <record name="expchan/sis3820_eh1b/3"></record>      
     </datasource>
          @type = NX_UINT64
          @units = counts
        diameter = 6.0
          @type = NX_FLOAT64
          @units = mm
        distance = 1.0
          @type = NX_FLOAT64
          @units = mm
        layout = point
          @type = NX_CHAR
        polar_angle = float64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="polar_angle_channel_3">      
      <record name="polar_angle_channel_3"></record>      
     </datasource>
          @type = NX_FLOAT64
          @units = degrees
      channel_4:NXdetector
        azimuthal_angle = 0.0
          @type = NX_FLOAT64
          @units = degrees
        count_time = uint64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="eh1b_c32">      
      <record name="expchan/sis3820_eh1b/32"></record>      
     </datasource>
          @type = NX_UINT64
          @units = microseconds
        data = uint64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="eh1b_c04">      
      <record name="expchan/sis3820_eh1b/4"></record>      
     </datasource>
          @type = NX_UINT64
          @units = counts
        diameter = 6.0
          @type = NX_FLOAT64
          @units = mm
        distance = 1.0
          @type = NX_FLOAT64
          @units = mm
        layout = point
          @type = NX_CHAR
        polar_angle = float64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="polar_angle_channel_4">      
      <record name="polar_angle_channel_4"></record>      
     </datasource>
          @type = NX_FLOAT64
          @units = degrees
      channel_5:NXdetector
        azimuthal_angle = 0.0
          @type = NX_FLOAT64
          @units = degrees
        count_time = uint64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="eh1b_c32">      
      <record name="expchan/sis3820_eh1b/32"></record>      
     </datasource>
          @type = NX_UINT64
          @units = microseconds
        data = uint64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="eh1b_c05">      
      <record name="expchan/sis3820_eh1b/5"></record>      
     </datasource>
          @type = NX_UINT64
          @units = counts
        diameter = 6.0
          @type = NX_FLOAT64
          @units = mm
        distance = 1.0
          @type = NX_FLOAT64
          @units = mm
        layout = point
          @type = NX_CHAR
        polar_angle = float64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="polar_angle_channel_5">      
      <record name="polar_angle_channel_5"></record>      
     </datasource>
          @type = NX_FLOAT64
          @units = degrees
      channel_6:NXdetector
        azimuthal_angle = 0.0
          @type = NX_FLOAT64
          @units = degrees
        count_time = uint64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="eh1b_c32">      
      <record name="expchan/sis3820_eh1b/32"></record>      
     </datasource>
          @type = NX_UINT64
          @units = microseconds
        data = uint64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="eh1b_c06">      
      <record name="expchan/sis3820_eh1b/6"></record>      
     </datasource>
          @type = NX_UINT64
          @units = counts
        diameter = 6.0
          @type = NX_FLOAT64
          @units = mm
        distance = 1.0
          @type = NX_FLOAT64
          @units = mm
        layout = point
          @type = NX_CHAR
        polar_angle = float64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="polar_angle_channel_6">      
      <record name="polar_angle_channel_6"></record>      
     </datasource>
          @type = NX_FLOAT64
          @units = degrees
      channel_7:NXdetector
        azimuthal_angle = 0.0
          @type = NX_FLOAT64
          @units = degrees
        count_time = uint64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="eh1b_c32">      
      <record name="expchan/sis3820_eh1b/32"></record>      
     </datasource>
          @type = NX_UINT64
          @units = microseconds
        data = uint64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="eh1b_c07">      
      <record name="expchan/sis3820_eh1b/7"></record>      
     </datasource>
          @type = NX_UINT64
          @units = counts
        diameter = 6.0
          @type = NX_FLOAT64
          @units = mm
        distance = 1.0
          @type = NX_FLOAT64
          @units = mm
        layout = point
          @type = NX_CHAR
        polar_angle = float64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="polar_angle_channel_7">      
      <record name="polar_angle_channel_7"></record>      
     </datasource>
          @type = NX_FLOAT64
          @units = degrees
      channel_8:NXdetector
        azimuthal_angle = 0.0
          @type = NX_FLOAT64
          @units = degrees
        count_time = uint64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="eh1b_c32">      
      <record name="expchan/sis3820_eh1b/32"></record>      
     </datasource>
          @type = NX_UINT64
          @units = microseconds
        data = uint64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="eh1b_c08">      
      <record name="expchan/sis3820_eh1b/8"></record>      
     </datasource>
          @type = NX_UINT64
          @units = counts
        diameter = 6.0
          @type = NX_FLOAT64
          @units = mm
        distance = 1.0
          @type = NX_FLOAT64
          @units = mm
        layout = point
          @type = NX_CHAR
        polar_angle = float64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="polar_angle_channel_8">      
      <record name="polar_angle_channel_8"></record>      
     </datasource>
          @type = NX_FLOAT64
          @units = degrees
      channel_9:NXdetector
        azimuthal_angle = 0.0
          @type = NX_FLOAT64
          @units = degrees
        count_time = uint64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="eh1b_c32">      
      <record name="expchan/sis3820_eh1b/32"></record>      
     </datasource>
          @type = NX_UINT64
          @units = microseconds
        data = uint64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="eh1b_c09">      
      <record name="expchan/sis3820_eh1b/9"></record>      
     </datasource>
          @type = NX_UINT64
          @units = counts
        diameter = 6.0
          @type = NX_FLOAT64
          @units = mm
        distance = 1.0
          @type = NX_FLOAT64
          @units = mm
        layout = point
          @type = NX_CHAR
        polar_angle = float64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="polar_angle_channel_9">      
      <record name="polar_angle_channel_9"></record>      
     </datasource>
          @type = NX_FLOAT64
          @units = degrees
      detector:NXcollection
        correction = float64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="correction">      
      <record name="correction"></record>      
     </datasource>
          @type = NX_FLOAT64
        count_time = uint64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="eh1b_c32">      
      <record name="expchan/sis3820_eh1b/32"></record>      
     </datasource>
          @type = NX_UINT64
          @units = microseconds
        delta_position = float64(2001)
          @nexdatas_source = <datasource type="CLIENT" name="delta_position">      
      <record name="delta_position"></record>      
     </datasource>
          @type = NX_FLOAT64
          @units = degrees
        interval = 2000.0
          @nexdatas_source = <datasource type="CLIENT" name="interval">      
      <record name="interval"></record>      
     </datasource>
          @type = NX_FLOAT64
        sample_time = 0.0
          @nexdatas_source = <datasource type="CLIENT" name="sample_time">      
      <record name="sample_time"></record>      
     </datasource>
          @type = NX_FLOAT64
          @units = s
        sweep_distance = 2.0
          @nexdatas_source = <datasource type="CLIENT" name="sweep_distance">      
      <record name="sweep_distance"></record>      
     </datasource>
          @type = NX_FLOAT64
          @units = degrees
        sweep_motor = eh1b_mot04
          @nexdatas_source = <datasource type="CLIENT" name="sweep_motor">      
      <record name="sweep_motor"></record>      
     </datasource>
          @type = NX_CHAR
        sweep_offset = 0.005
          @nexdatas_source = <datasource type="CLIENT" name="sweep_offset">      
      <record name="sweep_offset"></record>      
     </datasource>
          @type = NX_FLOAT64
          @units = degrees
        sweep_start = 7.0
          @nexdatas_source = <datasource type="CLIENT" name="sweep_start">      
      <record name="sweep_start"></record>      
     </datasource>
          @type = NX_FLOAT64
          @units = degrees
      insertion_device:NXinsertion_device
        gap = float64(2001)
          @nexdatas_source = <datasource type="TANGO" name="inserton_gap">      
      <record name="Taper"></record>      
      <device member="attribute" hostname="haspp02oh1" name="petra/undulator/pu02" port="10000"></device>      
     </datasource>
          @type = NX_FLOAT64
          @units = mm
        taper = float64(2001)
          @nexdatas_source = <datasource type="TANGO" name="inserton_taper">      
      <record name="Taper"></record>      
      <device member="attribute" hostname="haspp02oh1" name="petra/undulator/pu02" port="10000"></device>      
     </datasource>
          @type = NX_FLOAT64
          @units = mm
      monochromator:NXmonochromator
        crystal1:NXcrystal
          pitch = 1.11111111111e+15
            @type = NX_FLOAT
            @units = rad
          reflection = [1 1 1]
            @type = NX_INT
          roll = 1.11111111111e+11
            @type = NX_FLOAT
            @units = rad
          type = Si
            @type = NX_CHAR
          usage = Bragg
            @type = NX_CHAR
        crystal2:NXcrystal
          pitch = 1.11111111111e+12
            @type = NX_FLOAT
            @units = rad
          reflection = [3 1 1]
            @type = NX_INT
          roll = 111111111.0
            @type = NX_FLOAT
            @units = rad
          type = Si
            @type = NX_CHAR
          usage = Bragg
            @type = NX_CHAR
        energy = float64(2001)
          @nexdatas_source = <datasource type="TANGO" name="DCMenergy">      
      <record name="Position"></record>      
      <device member="attribute" hostname="haspp02oh1" name="p02/dcmener/oh.01" port="10000"></device>      
     </datasource>
          @type = NX_FLOAT
          @units = eV
      name = Hard X-Ray Diffraction Beamlines for Time Resolved Studies
        @short_name = P02
        @type = NX_CHAR
      source:NXsource
        current = float64(2001)
          @nexdatas_source = <datasource type="TANGO" name="source_current">      
      <record name="BeamCurrent"></record>      
      <device member="attribute" hostname="haspp02oh1" name="petra/globals/keyword" port="10000"></device>      
     </datasource>
          @type = NX_FLOAT
          @units = mA
        energy = float64(2001)
          @nexdatas_source = <datasource type="TANGO" name="source_energy">      
      <record name="Energy"></record>      
      <device member="attribute" hostname="haspp02oh1" name="petra/globals/keyword" port="10000"></device>      
     </datasource>
          @type = NX_FLOAT
          @units = GeV
        name = PETRAIII
          @short_name = PETRAIII
          @type = NX_CHAR
        probe = x-ray
          @type = NX_CHAR
        type = Synchrotron X-ray Source
          @type = NX_CHAR
    sample:NXsample
      MAD_rot = float64(2001)
        @nexdatas_source = <datasource type="TANGO" name="TG_eh1b_mot11">     
     <record name="Position"></record>     
     <device member="attribute" hostname="haspp02oh1" name="p02/motor/eh1b.11" port="10000"></device>     
    </datasource>
        @type = NX_FLOAT
        @units = degree
      Om = float64(2001)
        @nexdatas_source = <datasource type="TANGO" name="TG_eh1b_mot03">     
     <record name="Position"></record>     
     <device member="attribute" hostname="haspp02oh1" name="p02/motor/eh1b.03" port="10000"></device>     
    </datasource>
        @type = NX_FLOAT
        @units = degree
      Si_TT = float64(2001)
        @nexdatas_source = <datasource type="TANGO" name="TG_eh1b_mot12">     
     <record name="Position"></record>     
     <device member="attribute" hostname="haspp02oh1" name="p02/motor/eh1b.12" port="10000"></device>     
    </datasource>
        @type = NX_FLOAT
        @units = degree
      TTi = float64(2001)
        @nexdatas_source = <datasource type="TANGO" name="TG_eh1b_mot04">     
     <record name="Position"></record>     
     <device member="attribute" hostname="haspp02oh1" name="p02/motor/eh1b.04" port="10000"></device>     
    </datasource>
        @type = NX_FLOAT
        @units = degree
      TTo = float64(2001)
        @nexdatas_source = <datasource type="TANGO" name="TG_eh1b_mot07">     
     <record name="Position"></record>     
     <device member="attribute" hostname="haspp02oh1" name="p02/motor/eh1b.07" port="10000"></device>     
    </datasource>
        @type = NX_FLOAT
        @units = degree
      chemical_formula = LaB6
        @nexdatas_source = <datasource type="CLIENT" name="chemical_formula">     
     <record name="chemical_formula"></record>     
    </datasource>
        @type = NX_CHAR
      diffh = float64(2001)
        @nexdatas_source = <datasource type="TANGO" name="TG_eh1b_mot01">     
     <record name="Position"></record>     
     <device member="attribute" hostname="haspp02oh1" name="p02/motor/eh1b.01" port="10000"></device>     
    </datasource>
        @type = NX_FLOAT
        @units = mm
      diffv = float64(2001)
        @nexdatas_source = <datasource type="TANGO" name="TG_eh1b_mot02">     
     <record name="Position"></record>     
     <device member="attribute" hostname="haspp02oh1" name="p02/motor/eh1b.02" port="10000"></device>     
    </datasource>
        @type = NX_FLOAT
        @units = mm
      name = LaB6
        @nexdatas_source = <datasource type="CLIENT" name="sample_name">     
     <record name="sample_name"></record>     
     <doc>      Data source providing the name of the sample.     </doc>     
    </datasource>
        @type = NX_CHAR
      samx = float64(2001)
        @nexdatas_source = <datasource type="TANGO" name="TG_eh1b_mot08">     
     <record name="Position"></record>     
     <device member="attribute" hostname="haspp02oh1" name="p02/motor/eh1b.08" port="10000"></device>     
    </datasource>
        @type = NX_FLOAT
        @units = mm
      samy = float64(2001)
        @nexdatas_source = <datasource type="TANGO" name="TG_eh1b_mot09">     
     <record name="Position"></record>     
     <device member="attribute" hostname="haspp02oh1" name="p02/motor/eh1b.09" port="10000"></device>     
    </datasource>
        @type = NX_FLOAT
        @units = mm
      samz = float64(2001)
        @nexdatas_source = <datasource type="TANGO" name="TG_eh1b_mot10">     
     <record name="Position"></record>     
     <device member="attribute" hostname="haspp02oh1" name="p02/motor/eh1b.10" port="10000"></device>     
    </datasource>
        @type = NX_FLOAT
        @units = mm
      spinner = float64(2001)
        @nexdatas_source = <datasource type="TANGO" name="TG_eh1a_mot09">     
     <record name="Position"></record>     
     <device member="attribute" hostname="haspp02oh1" name="p02/motor/eh1a.09" port="10000"></device>     
    </datasource>
        @type = NX_FLOAT
        @units = degree
    start_time = 2013-06-10T16:01:13.447050+0200
      @nexdatas_source = <datasource type="CLIENT" name="start_time">    
    <record name="start_time"></record>    
    <doc>     The start time is provided by the control client.    </doc>    
   </datasource>
      @type = NX_DATE_TIME