public function addEntry( $entry, $section )
	{
		if( isset( $this->list[$section] ) && is_array( $this->list[$section] ) && in_array( $entry, $this->list[$section] ) )
			throw new InvalidArgumentException( 'Entry "'.$entry.'" is already in Section "'.$section.'".' );
		$this->list[$section][] = $entry;
	}