private function _readMsoDrawing()
	{
		$length = self::_GetInt2d($this->_data, $this->_pos + 2);

		// get spliced record data
		$splicedRecordData = $this->_getSplicedRecordData();
		$recordData = $splicedRecordData['recordData'];

		$this->_drawingData .= $recordData;
	}