quence containing all attribute types used
                  for the token definitions or the type <code class="computeroutput"><span class="identifier">omit</span></code>.
                  If the mpl sequence is empty (which is the default), all token
                  instances will store 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 