code><span class="keyword">module</span> <a href="TraceList/index.html">TraceList</a> : <span class="keyword">sig</span> ... <span class="keyword">end</span></code></dt><dd><p>Representation of trace lists on disk.</p></dd></dl><dl><dt class="spec value" id="val-epoch"><a href="#val-epoch" class="anchor"></a><code><span class="keyword">val</span> epoch : int</code></dt><dd><p>An epoch independant of the isla version, bump if you change the representation of the traces on disk.</p><p>Reset (or not) when bump