ecial">,</span> <span class="identifier">posix_time_system</span> <span class="special">&gt;</span> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
  <span class="comment">// types</span>
  <span class="keyword">typedef</span> <span class="identifier">posix_time_system</span>                    <a name="boost.posix_time.ptime.time_system_type"></a><span class="identifier">time_system_type</span><span class="special">;</span>  
  <span class="keyword">typedef<