 name="boost.xpressive.c_regex_traits.version_tag"></a><span class="identifier">version_tag</span><span class="special">;</span>    
  <span class="keyword">typedef</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span>                    <a name="boost.xpressive.c_regex_traits.base_type"></a><span class="identifier">base_type</span><span class="special">;</span>      

  <span class="comment">// <a class="link" href="c_regex_traits.html#boost.xpressive.c_regex_traitsconst