irit.qi.tutorials.roman_numerals.rules"></a></span><a class="link" href="roman_numerals.html#spirit.qi.tutorials.roman_numerals.rules">Rules</a>
        </h6>
<p>
          Up until now, we've been inlining our parser expressions, passing them
          directly to the <code class="computeroutput"><span class="identifier">phrase_parse</span></code>
          function. The expression evaluates into a temporary, unnamed parser which
          is passed into the <code class="computeroutput"><span class="identi