<span class="keyword">sig</span> ... <span class="keyword">end</span></code></div><div class="spec module" id="module-Label"><a href="#module-Label" class="anchor"></a><code><span class="keyword">module </span><a href="Label">Label</a> : <span class="keyword">sig</span> ... <span class="keyword">end</span></code></div><div class="spec module" id="module-Legend"><a href="#module-Legend" class="anchor"></a><code><span class="keyword">module </span><a href="Legend">Legend</a> : <span class="keyword">sig</span>