[Zope] Referencing documents with dots in the name from dtml

Hi, Im tring to do a template in DTML for all my pages. and i have the following question: i have a dtml document named content.html (and i want it to be named that way, so i open it by FTP and editors will recognize it as HTML) and in index_html i try this: <dtml-var content.html.title> or <dtml-var "content.html.title"> and it doesnt work. how can i do this using DTML?