:</span>
  <span class="comment">// types</span>
  <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span> <span class="identifier">Char</span> <span class="special">&gt;</span>                               <a name="boost.process.basic_environment.string_type"></a><span class="identifier">string_type</span><span class="special">;</span>   
  <span class="keyword">typedef</span> <span