code: def get_flags_str(element):
          '''get_flags_str
  
          High-level api: Produce a string that represents the type of a node.
  
          Parameters
          ----------
  
          element : `Element`
              A node in model tree.
  
          Returns
          -------
  
          str
              A string that represents the type of a node.
          '''
  
          type_info = element.get('type')
          if type_info == 'rpc' or type_info == 'action':
              return '-x'
          elif type_info == 'notification':
              return '-n'
          access_info = element.get('access')
          if access_info is None:
              return ''
          elif access_info == 'write':
              return '-w'
          elif access_info == 'read-write':
              return 'rw'
          elif access_info == 'read-only':
              return 'ro'
          else:
              return '--f get_flags_str(element):
          '''get_flags_str
  
          High-level api: Produce a string that represents the type of a node.
  
          Parameters
          ----------
  
          element : `Element`
              A node in model tree.
  
          Returns
          -------
  
          str
              A string that represents the type of a node.
          '''
  
          type_info = element.get('type')
          if type_info == 'rpc' or type_info == 'action':
              return '-x'
          elif type_info == 'notification':
              return '-n'
          access_info = element.get('access')
          if access_info is None:
              return ''
          elif access_info == 'write':
              return '-w'
          elif access_info == 'read-write':
              return 'rw'
          elif access_info == 'read-only':
              return 'ro'
          else:
              return '--'
docs: get_flags_str
  
          High-level api: Produce a string that represents the type of a node.
  
          Parameters
          ----------
  
          element : `Element`
              A node in model tree.
  
          Returns
          -------
  
          str
              A string that represents the type of a node.