[Zope] mime attachments and multi-part forms

I trying to create a form that conditionally allows files to be included in the submission. This is no problem. However I want these files to be sent in an email message. Using the <dtml-mime> and <dtml-boundry> tags is fine however I can seem to do something like the following <dtml-mime><dtml-if blah><dtml-boundry><dtml-var blah></dtml-mime> This seems a big shortcoming in the syntax of the mime tag. Has anyone managed to get around this? Also, with the multipart form, is there anyway to get at the filename of the file uploaded and then subsequently use that as the name of the attachment in the email?