[Zope] <newbie>What am i missing? Calling zsqlmethods from different folder</newbie>

I've got a sql-method in one folder called /MovieReviews and want to call it in my /index_html-document. Tried <dtml-in "MovieReviews.sqlMethod"> and hundereds of variants, but with little luck. Looked in the docs at www.zope.org but cannot find anything similar. Isn't this a very common thing? I like to put all my sql-related stuff in one folder and the html things in another etc. Isn't the stuff I create in subfolders available in the root? Thanks for you patience. Best regards, Thomas