[Zope] XML Documents editor

Hi all I am interested in haveing a solution for the users to be able to create/edit and save documents in the following manner. The documents may contain tables/lists/images. I would like the the documents to be saved in XML on the server. The users may get a copy and edit on their machines (if possible using their favourite word processors) and overwrite the copy on the server. The issue here would be whether the word processor can save in XML without adding its own proprietary tags. The "portability" of the documents is a concern here. Is there any XML editor that can be used for this purpose ? TIA Chetan