 the structure of the input, it also
      enables the specification of the output format for your data in a similar way,
      and based on a single syntax and compatible semantics.
    </p>
<p>
      Let's assume we need to generate a textual representation from a simple data
      structure such as a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span><span class="keyword">int</span><span cla