[Zope] reading text file object

I made a template that changes the location name and content due to the information stored in the title property variable and the file content of a "File" object. I used the dtml tag <dtml-var title> to call the "title" information but I don't know of any dtml tag that would call the content other than calling the "id" of the File object. ex. File object "test" Call method "<dtml-var test>" Could anyone help out. Is there any other ways to call the content of the text "File" object?