HTML form (XForms) --> XML Document without a web server?

What I'd like to do:
a) create an XML document (that has an HTML form interface?) and give
it to a user who
opens it with IE6/7 or Firefox;
b) the user fills the form and submits it (without any
web server interaction/requirement);
c) the user data is captured by/saved to this XML document.

Another way to put it, caputure simple user data via a web brower
without a web server.

Is the above doable? FormFaces looks interesting and yet at the
first glance, a bit too much for this?

Thanks.