an> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="special">&gt;</span> <a class="link" href="../boost/property_tree/ptree.html" title="Type definition ptree"><span class="identifier">ptree</span></a><span class="special">;</span>
    <span class="keyword">typedef</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a class="link" href="../boost/property_tree/iptree.html" title="Type definition iptre