de><span><span class="keyword">module</span> <a href="CostKind/index.html">CostKind</a></span><span> : <span class="keyword">sig</span> ... <span class="keyword">end</span></span></code></div></div><div class="odoc-spec"><div class="spec module anchored" id="module-DB"><a href="#module-DB" class="anchor"></a><code><span><span class="keyword">module</span> <a href="DB/index.html">DB</a></span><span> : <span class="keyword">sig</span> ... <span class="keyword">end</span></span></code></div><div class="spec-do