public function purgeRollbackPoints()
	{
		$tagList        = $this->call('tag');
		$tags           = explode("\n", $tagList);
		$rollbackPoints = array();

		foreach ($tags as $tag)
		{
			if (strstr($tag, 'cmsrollbackpoint-') !== false)
			{
				$rollbackPoints[] = $tag;
			}
		}

		if (count($rollbackPoints) > 1)
		{
			for ($i=0; $i < (count($rollbackPoints) - 1); $i++)
			{
				$this->call('tag', array('-d', $rollbackPoints[$i]));
			}
		}
	}