grab r1370907 from trunk:

    the service of <module>mod_dav</module>. But without a backend provider

    which makes use of it, it's useless and should not be loaded into the

    server. A sample backend module which actually utilizes

    <module>mod_dav_lock</module> is <a href="http://subversion.tigris.org/"

    <module>mod_dav_lock</module> is <a href="http://subversion.apache.org/"

    >mod_dav_svn</a>, the subversion provider module.</p>

    <p>Note that <module>mod_dav_fs</module> does <em>not</em> need this