[Zope] how to upload text?

I want to make a form where a variable can take input either from a textarea form element, or from a file upload. I've seen some things about how to upload files, but I don't want to save the data as files, I want to load it into a textarea form element where it can be edited if needed and then it will be saved in a database. Is there an example or a recipe to do this anywhere? thanks, john