public function setPossibleOptions( $options )
	{
		if( !is_array( $options ) )														//  no Array given
			throw InvalidArgumentException( 'No array given.' );						//  throw Exception
		if( $options === $this->possibleOptions )										//  threse Options are already set
			return FALSE;																//  do nothing
		$this->possibleOptions	= $options;												//  set new Options
		return TRUE;																	//  indicate Success
	}