Capability.php

<?php

/**
 * @ORM\Entity
 * @ORM\Table(name="capability")
 */
class Capability
{
    /**
     * @ORM\Column(type="integer")
     * @ORM\GeneratedValue(strategy="AUTO")
     * @ORM\Id
     * @var integer $id
     */
    protected $id;

    /**
     * @ORM\Column(type="string")
     * @var string $description
     */
    protected $description;

Profile.php

<?php

/**
 * @ORM\Entity
 * @ORM\Table(name="profile")
 * @Serialize\ExclusionPolicy("all")
 * @Serialize\XmlRoot("profile")
 */
class Profile extends BaseProfile
{

    /**
     * @ORM\ManyToMany(targetEntity="Capability")
     * @Serialize\Expose
     * @Serialize\XmlList(entry="capability")
     * @var Collection
     */
    protected $capabilities;