A small addition that would be incredibly handy to the wiki module would be a test to see if an article exists.

I have a discussion namespace next to my regular pages, allowing my users to discuss the topics. I’d like to display the “Discussion” tab more proeminently if there is actually a discussion associated to a topic. So I need from a topic (e.g. “Nikon D300") to test if the related discussion topic exists, something like:

{if topic_exists=Discussion:{url_title}}
more proeminent display
{/if}

I know that, in a wiki, every page exists in some way since users can always create a new page. The test, of course, should be whether the page has been created already.

--ben