<object data="...foo.rdf" height=... width=...>and have a NavCenter tree widget appear in the html. It will allow for sorting, multiple selection drag and drop, etc. Changes made to the data in foo.rdf can be sent back to a server (or the foo.rdf can be specified to be read-only, in which case, changes will not be allowed).
This will provide a very scalable version of data binding. The ability to tell the server what has changed is also very important : it allows for the next generation of HTML-based applications.