constructor( referenceNode, indexNode ) {

		super( referenceNode, indexNode );

		/**
		 * Similar to {@link ReferenceBaseNode#reference}, an additional
		 * property references to the current node.
		 *
		 * @type {?ReferenceBaseNode}
		 * @default null
		 */
		this.referenceNode = referenceNode;

		/**
		 * This flag can be used for type testing.
		 *
		 * @type {boolean}
		 * @readonly
		 * @default true
		 */
		this.isReferenceElementNode = true;

	}
Constructs a new reference element node.

@param {ReferenceBaseNode} referenceNode - The reference node.
@param {Node} indexNode - The index node that defines the element access.