d iterator. The lexical analyzer
        itself exposes a standard forward iterator as well. The difference here is
        that the exposed iterator provides access to the token sequence instead of
        to the character sequence. The tokens in this sequence are constructed on
        the fly by analyzing the underlying character sequence and matching this
        to the patterns as defined by the application.
      </p>
<p>
        </p>
<div class="figure">
<a name="spirit.lexerflow"></a><p class="title