SPACE</span></code>, which will
        force the Spirit Classic code to be in the namespace <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span></code>
        as before. This is not recommended, though, as it may result in naming clashes.
      </p>
<p>
        The change of the namespace will be automatically deactivated whenever the
        deprecated include files are being used. This ensures full backwards compatibility