public function mergeAction($action, $identities)
	{
		if (isset($this->data[$action]))
		{
			// If exists, merge the action.
			$this->data[$action]->mergeIdentities($identities);
		}
		else
		{
			// If new, add the action.
			$this->data[$action] = new Rule($identities);
		}
	}