ttributes of Compound Components</a>
</h4></div></div></div>
<p>
          While parsing input or generating output it is often desirable to combine
          some constant elements with variable parts. For instance, let us look at
          the example of parsing or formatting a complex number, which is written
          as <code class="computeroutput"><span class="special">(</span><span class="identifier">real</span><span class="special">,</span> <span class="identifier">imag</span><span class="special">)