ication.
</li></ul></div></div><h1 id="g:3">Registry
</h1><div class="doc"><p>Before we continue the survey of basic patterns,
      we have to introduce registries.
      Registries are used by some patterns, advanced patterns,
      but also publishers,
      to use a set of providers that register beforehand
      or, in the case of publishers, 
      to serve a set of consumers that have registered to
      the publisher.
      A typical example is balancers (<em>majordomo pattern</em>):
      Servers o