an> <a href="Shape/Type/index.html#type-elt">Shape.Type.elt</a></span></code></div><div class="spec-doc"><p>get value from input and create an node and wrap in Elt type</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-new_block_id"><a href="#val-new_block_id" class="anchor"></a><code><span><span class="keyword">val</span> new_block_id : <span>unit <span class="arrow">&#45;&gt;</span></span> int</span></code></div><div class="spec-doc"><p><code>new_block_id ()</code> returns an 