For "versioning" I mean something which takes the RCS (or CVS) philosophy to the file system level. Something like VMS was use to do (does it still exist?), i.e. just keeping several copies of the same file with a version number appended would not be enough: VMS didn't hold difference, just put away new copies (very space consuming, maybe even for modern disks).
Best regards.
-- Andrea Giuliano, Ph. D. ICCU - Istituto Centrale per il Catalogo Unico Viale Castro Pretorio 105, Rome - ITALY Tel. +39064989509, Fax +39064059302