code: function toString()
      {
          return "Attachment [id=" . $this->id . ", "
                  . "filename=" . $this->filename . ", "
                  . "sizekb=" . $this->sizekb . ", "
                  . "mime_type=" . $this->mime_type . ", "
                  . "diagnosis=" . $this->diagnosis . ", "
                  . "created=" . $this->created . ", "
                  . "updated=" . $this->updated . "]";
      }
docs: Human readable representation of this wrapper.
  
  @return \em string
  A human readable version of the mailing.