This code depends on code introduced into the developement branch for PHP 4.3, so it will not run with PHP releases before 4.3.0 preliminary documentation is available in the dav.txt file, although it is currently a little outdated ... Server/Filesystem.php contains a sample implementation for a simple file server (including property and lock info storage in a mySQL database, see db/Fileserver.sql). This sample should give you a good clue about how to use this class for your own purpose.