tml" target="_top">Boost.Lambda</a> use
            the placeholders defined in the namespace <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">lambda</span></code>.
          </p>
<p>
            For semantic actions written using <a href="../../../../../../../libs/phoenix/doc/html/index.html" target="_top">Boost.Phoenix</a>
            use the placeholders defined in the namespace <code class="computeroutput"><span class="identifier">