[Zope] uploading xml files

I have a form which uploads an xml file into zope. Is it possible to display the contents of this file in a dtml method which is the target of the upload form action. I have searched all over for an answer and have come up empty. I know this may be simple to some people but at the moment this is blocking my further progress with zope. If there is any documentation on this subject could someone point me at it please? regards garry