code: def parse_implicit_document_start(self):
      # Parse an implicit document.
      if not self.check_token(
          DirectiveToken, DocumentStartToken, StreamEndToken
      ):
          self.tag_handles = self.DEFAULT_TAGS
          token = self.peek_token()
          start_mark = end_mark = token.start_mark
          event = DocumentStartEvent(
              start_mark, end_mark, explicit=False
          )
  
          # Prepare the next state.
          self.states.append(self.parse_document_end)
          self.state = self.parse_block_node
  
          return event
  
      else:
          return self.parse_document_start()
  
imports: from .error import MarkedYAMLError
  from .tokens import *
  from .events import *
  from .scanner import *
label_desc: Use image node_id 7 for calling the Parser obj's underlying member method code with example usage: obj.parse_implicit_document_start() and returns: event, self