code: def _read_plain(self, lines):
          
          self.log(u"Parsing fragments from plain text format")
          id_format = self._get_id_format()
          lines = [line.strip() for line in lines]
          pairs = []
          i = 1
          for line in lines:
              identifier = id_format % i
              text = line.strip()
              pairs.append((identifier, [text]))
              i += 1
          self._create_text_fragments(pairs)
docs: Read text fragments from a plain format text file.
  
          :param list lines: the lines of the plain text file
          :param dict parameters: additional parameters for parsing
                                  (e.g., class/id regex strings)
          :raises: ValueError: if the id regex is not valid