title: SVN - Automatically generate unique ID for every versioned file
body: <p>Is there an unique identifier for every versioned file in an SVN repository? If yes, can it be read using some <code>svn</code> command? If no, is it possible to generate one on every <code>svn add</code> call? </p>
  
  <p>For example, if I have a GUID generator application, can I call it on every <code>svn add</code>, and somehow bind its output (the new GUID) tightly to the added file? Storing it locally is not enough: the unique ID must be stored on the SVN server, because we must be able to download it during every <code>svn checkout</code> and <code>svn update</code>.</p>