ra* federation protocol</a>
    </div>

    <div id="navbar" class="navbar-collapse collapse">

      <ul class="visible-xs nav navbar-nav navbar-right">
        <li class="{% include active_class.html url="/" %}"><a href="{{ site.baseurl }}/index.html">Overview</a></li>
        <li class="dropdown">
          <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Discovery <span class="caret"></span></a>
          {% include discovery_tree.html u