.t</a>)</span> list</span></span></code></div><div class="spec-doc"><p>returns the variables annoted by their type and their definition domain</p></div></div><h2 id="measure"><a href="#measure" class="anchor"></a>Measure</h2><div class="odoc-spec"><div class="spec value anchored" id="val-volume"><a href="#val-volume" class="anchor"></a><code><span><span class="keyword">val</span> volume : <span><a href="#type-t">t</a> <span class="arrow">&#45;&gt;</span></span> float</span></code></div><div class="spec-doc"