  which means the token instance holds a <a href="../../../../../../../../libs/range/doc/html/range/reference/utilities/iterator_range.html" target="_top"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">iterator_range</span></code></a> pointing
                  to the start and the end of the matched section in the input stream.
                  If the attribute is <code class="computeroutput"><span class="identifier">omit</span></c