// ContentTrait.php

<?php

namespace Example\FrontendBundle\Document;

use Doctrine\ODM\PHPCR\Mapping\Annotations as PHPCR;

trait ContentTrait {

   /**
     * @PHPCR\Id()
     */
    protected $id;

    /**
     * @PHPCR\ParentDocument()
     */
    protected $parent;

   /**
     * The language this document currently is in
     * @PHPCR\Locale
     */
    protected $locale;

    /**
     * @PHPCR\Nodename()
     */
    protected $nodename;


     /**
     * @PHPCR\Date()
     */
    protected $date;


    /**
     * @PHPCR\Referrers(
     *     referringDocument="Symfony\Cmf\Bundle\RoutingBundle\Doctrine\Phpcr\Route",
     *     referencedBy="content"
     * )
     */
    protected $routes;


	// Getters and Setters here

}


// Page.php

<?php

namespace Example\FrontendBundle\Document;

use Doctrine\ODM\PHPCR\Mapping\Annotations as PHPCR;
use Symfony\Cmf\Component\Routing\RouteReferrersReadInterface;

/**
 * @PHPCR\Document(referenceable=true, translator="attribute")
 */
class Page implements RouteReferrersReadInterface
{

    use ContentTrait;

    /**
     * @PHPCR\String(nullable=true, translated=true)
     */
    protected $title;

    /**
     * @PHPCR\String(nullable=true, translated=true)
     */
    protected $content;

   // Getters and Setters here
}


// Controller.php
// in create Action

        $rootNode = $dm->find(null, $this->root_path);
        $document->setParentDocument($rootNode);
        $dm->persist($document);
        $dm->flush();