[Zope] Displaying a pdf file.

Hello, What is the best way to display a pdf file in a zope application. I may select the file from an oracle database of get it from a file system. I'm not sure at the moment. My Zope Bible book shows how to upload a pdf file from a filesytem then view it. But in my case the pdf I want to view is based on an ID entered by the user. There may be many different pdf and I can't upload them all. I want to be able to 1) if the the pdf is on server then view (\docs\my.pdf) using the correct application type or 2) if I select the pdf from an oracle table (stored as a BLOB) <dtml-in sql-get_pdf> somehow display the pdf </dtml-in> Thanks for your help Mike Guerrero