    - add a property editor to the Web interface
    - handle LOCK timeouts
    - RFC5689 (extended MKCOL) is incomplete (error handling/precondition check)
    - RFC3744 (ACL's) (incomplete)
    - RFC4791 (CalDAV) incomplete
    - Collection Synchronization for WebDAV (http://tools.ietf.org/html/draft-daboo-webdav-sync-03)
    - RFC5842 (Binding Extensions to Web Distributed Authoring and Versioning (WebDAV))
    - RFC5785 (Defining Well-Known Uniform Resource Identifiers (URIs))
    - improve/fix precondition checks (If header)

    - write a backend module:
    	check: open, dirname, basename, -f, -e, -w, -d, -l, -x, -z, -b, -c, -k, -u, -g
		mkdir, rename, unlink, chmod, umask, stat, lstat
