[Zope] global upgrade of dtml tags from version 1 to 2

I wonder, has anyone written an external method to traverse the entire Zope database upgrading DTML tags from version 1 to version 2 syntax? <!--#var title--> and <dtml-var title> are functionally equivalent but the latter is much more esthetically pleasing. Cheers, Darran. Darran Edmundson [Darran.Edmundson@anu.edu.au]