/** Specific type of node for media. All nodes returned by {@link jibo.kb.media.MediaModel}
 * will be MediaNodes.
 *
 * @class MediaNode
 * @extends jibo.kb.Node
 * @memberof jibo.kb.media
 */

    /** UUID of the media.
     *
     * @name jibo.kb.media.MediaNode#id
     * @type {String}
     */

    /** The loopId this media belongs to.
     *
     * @name jibo.kb.media.MediaNode#loopId
     * @type {String}
     */

    /** The url that points to the actual media content.
     *
     * @name jibo.kb.media.MediaNode#url
     * @type {String}
     */

    /** Get the content ID of the thumbnail for this media item.
     * @method jibo.kb.media.MediaNode#getThumbnailId
     * @param {jibo.media#ThumbnailType} [type=thumb_robot] Type of thumbnail.
     * @returns {string} Content ID of the thumbnail, if any,
     * `undefined` otherwise.
     */