code: def set_beginTimestamp(self,btimestamp=None):
          
          if btimestamp is None:
              import time
              btimestamp = time.strftime('%Y-%m-%dT%H:%M:%S%Z')
          self.node.set('beginTimestamp',btimestamp)
docs: Set the begin timestamp of the linguistic processor, set to None for the current time
          @type btimestamp: string
          @param btimestamp: version of the linguistic processor