text: from ..Base.Identification import Identification as BaseId
  
  class Identification(BaseId):
      '''
      Simple object to hold identification information for NISAR SLC products.
      '''
      def __init__(self, *args, **kw):
          '''
          Identify given object as relevant NISAR product.
          '''
          self.trackNumber = None
          self.frameNumber = None
          super().__init__(*args, **kw)
  
  
      def unpack(self, h5grp):
          '''
          Populate self with hdf5 group.
          '''
          from nisar.h5 import extractScalar, bytestring
  
          BaseId.unpack(self, h5grp)
  
          self.trackNumber = extractScalar(h5grp, 'trackNumber',
                                        int, self.context['info'],
                                        'Track number could not be identified')
          self.frameNumber = extractScalar(h5grp, 'frameNumber',
                                        int, self.context['info'],
                                        'Frame number could not be identified')
  