code: def unbounded(self):
          
          max = self.max
          if max is None:
              max = '1'
          if max.isdigit():
              return (int(max) > 1)
          else:
              return max == 'unbounded'
docs: Get whether this node is unbounded I{(a collection)}
          @return: True if unbounded, else False.
          @rtype: boolean