class_docstr: Initialize an instance of PomdpX reader class
  
  Parameters
  ----------
  path : file or str
      Path of the file containing PomdpX information.
  
  string : str
      String containing PomdpX information.
  
  Example
  -------
  reader = PomdpXReader('TestPomdpX.xml')
  
  Reference
  ---------
  http://bigbird.comp.nus.edu.sg/pmwiki/farm/appl/index.php?n=Main.PomdpXDocumentation
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docstr: Return the problem description
  
  Examples
  --------
  >>> reader = PomdpXReader('Test_Pomdpx.xml')
  >>> reader.get_description()
  'RockSample problem for map size 1 x 3.
  Rock is at 0, Rover’s initial position is at 1.
  Exit is at 2.'
  >>> reader = PomdpXReader('Test_PomdpX.xml')
  >>> reader.get_description()
  'RockSample problem for map size 1 x 3.
   Rock is at 0, Rover’s initial position is at 1.
   Exit is at 2.'
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code: def get_description(self):
      """
      Return the problem description
  
      Examples
      --------
      >>> reader = PomdpXReader('Test_Pomdpx.xml')
      >>> reader.get_description()
      'RockSample problem for map size 1 x 3.
      Rock is at 0, Rover’s initial position is at 1.
      Exit is at 2.'
      >>> reader = PomdpXReader('Test_PomdpX.xml')
      >>> reader.get_description()
      'RockSample problem for map size 1 x 3.
       Rock is at 0, Rover’s initial position is at 1.
       Exit is at 2.'
      """
      return self.network.find("Description").text
  
imports: import xml.etree.ElementTree
  from collections import defaultdict
label_desc: Use image node_id 2 for calling the PomdpXReader obj's underlying member method code with example usage: obj.get_description() and returns: self