  >>> from liblas import vlr
  >>> v = vlr.VLR()
  >>> v.reserved
  0
  >>> v.recordid
  0
  >>> v.recordid = 2
  >>> v.recordid
  2
  >>> v.userid
  ''
  >>> v.userid = 'liblas.org'
  >>> v.userid
  'liblas.org'
  
  >>> v.description
  ''
  >>> v.description = 'libLAS'
  >>> v.description
  'libLAS'
  
  >>> from liblas import file
  >>> f = file.File('../test/data/srs.las')
  >>> h = f.header
  >>> h.records_count
  3L
  >>> h.proj4
  '+proj=utm +zone=17 +ellps=WGS84 +units=m '
  >>> v = h.GetVLR(0)
  >>> v.recordid
  34735
  >>> v.userid
  'LASF_Projection'
  
  >>> data = v.data
  >>> len(data)

