Access Nodes in a TYPO3 Neos Package Controller

PersonsController.php

<?php
namespace My\Package\Controller;

class PersonsController extends ActionController {

	/**
	 * @return void
	 */
	public function personsAction() {

		$currentDocumentNode = $this->request->getInternalArgument('__documentNode');
		if ($currentDocumentNode !== NULL) {

			$parentNode = $currentDocumentNode->getParent();

			$personsNode = $parentNode->getNode('persons');

			foreach ($personsNode->getChildNodes() as $personNode) {
				if ( $personNode->getProperty('maincontactfor') ) {

					// do something great..
					
				}
			}
		}

	}

}