67a68,90
>    * Get an element by a series of segment names.
>    *
>    * @param {Array} path - The series of fieldnames. Cannot be empty.
>    *
>    * @returns {Element} The element.
>    */
>   getChild(path) {
>     if (!path) {
>       return undefined;
>     }
>     let element = this.elements.get(path[0]);
>     let i = 1;
>     while (i < path.length) {
>       if (element === undefined) {
>         return undefined;
>       }
>       element = element.get(path[i]);
>       i++;
>     }
>     return element;
>   }
> 
>   /**