Partially applied function in scala template

gistfile1.scala

@(category:models.Category)

@defining(if(category==null) routes.RssController.feedAll(_:String) else routes.RssController.feed(_:String, category.id )) { rssUrl =>

<div id="newsFeedBlock">
	<a href="@rssUrl("rss_2.0")" target="_blank">
		<img id="newsFeedIcon" src="/assets/images/feed-icon-28x28.png" alt="NewsFeed" />
	</a>
	<div id="rssDetails" style="display: none;" />
		Abonnieren als 
		<a href="@rssUrl("rss_2.0")" target="_blank">Rss 2.0</a>
		oder
		<a href="@rssUrl("atom_1.0")" target="_blank">Atom 1.0</a>
		Feed ? 
	</div>
</div>