deferred class interface P_TEXT_OBJECT
feature(s) from P_TEXT_OBJECT
   --  Public interface
   to_string: STRING
      ensure
         is_copy: Result /= Void
   from_string (str: STRING)
      --  Init object from string.
      require
         valid: str /= Void
      ensure
         done:  --  success implies to_string.is_equal(str)
end of deferred P_TEXT_OBJECT