n class="code-line-container"><span data-line-number="4" class="code-number" style="display: none;"></span><span class="code-line">   let currentLocation: Location</span></span>
<span class="code-line-container"><span data-line-number="5" class="code-number" style="display: none;"></span><span class="code-line">}</span></span>
</code></pre>
  </div>
</div><p>As expected, <code>Part</code> is a property of <code>Whole</code>, maybe not directly, it could be several nodes deep in the tree.</p><p>Because our <