docs: def parse_on_start(self, node):
          """
          Parses <OnStart>
  
          @param node: Node containing the <OnStart> element
          @type node: xml.etree.Element
          """
  
          event_handler = OnStart()
  
          self.current_regime.add_event_handler(event_handler)
  
          self.current_event_handler = event_handler
          self.process_nested_tags(node)
          self.current_event_handler = None