This program is a wrapper (and server-side hook) that implements revision number aliasing. The wrapper rewrites the Subversion command-line, replacing labels (aliases) with the equivalent revision numbers. Subversion server hooks are used so that the label mappings are kept on the server and are accessed via the Subversion connection.
Note: This started out as a proof-of-concept and indirectly is a back-door implementation of (unversioned) property searching. It is no longer maintained.