"identifier">string_type</span><span class="special">;</span>    
  <span class="keyword">typedef</span> <span class="identifier">CharT</span>                                     <a name="boost.date_time.period_parser.char_type"></a><span class="identifier">char_type</span><span class="special">;</span>      
  <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">istreambuf_iterator</span><span class="special">&lt;</span> <span class