v><div class="odoc-spec"><div class="spec value" id="val-to_category" class="anchored"><a href="#val-to_category" class="anchor"></a><code><span><span class="keyword">val</span> to_category : <span><a href="#type-t">t</a> <span class="arrow">&#45;&gt;</span></span> <a href="#type-category">category</a></span></code></div><div class="spec-doc"><p>Return the category to which the attribute belongs.</p></div></div><div class="odoc-spec"><div class="spec value" id="val-is_undef" class="anchored"><a href="#val-i