src/Facebook/InstantArticles/Elements/Image.php [77:136]:
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    private function __construct()
    {
    }

    /**
     * Factory method for the Image
     * @return Image the new instance
     */
    public static function create()
    {
        return new self();
    }

    /**
     * This sets figcaption tag as documentation. It overrides all sets
     * made with Caption.
     *
     * @param Caption $caption the caption the image will have
     *
     * @return $this
     */
    public function withCaption($caption)
    {
        Type::enforce($caption, Caption::getClassName());
        $this->caption = $caption;

        return $this;
    }

    /**
     * Sets the URL for the image. It is REQUIRED.
     *
     * @param string $url The url of image. Ie: http://domain.com/img.png
     *
     * @return $this
     */
    public function withURL($url)
    {
        Type::enforce($url, Type::STRING);
        $this->url = $url;

        return $this;
    }

    /**
     * Sets the aspect ration presentation for the video.
     *
     * @param string $presentation one of the constants ASPECT_FIT, ASPECT_FIT_ONLY, FULLSCREEN or NON_INTERACTIVE
     * @see Image::ASPECT_FIT
     * @see Image::ASPECT_FIT_ONLY
     * @see Image::FULLSCREEN
     * @see Image::NON_INTERACTIVE
     *
     * @return $this
     */
    public function withPresentation($presentation)
    {
        Type::enforceWithin(
            $presentation,
            [
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src/Facebook/InstantArticles/Elements/Video.php [105:166]:
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    private function __construct()
    {
    }

    /**
     * Factory method
     *
     * @return Video the new instance from Video
     */
    public static function create()
    {
        return new self();
    }

    /**
     * This sets figcaption tag as documentation. It overrides all sets
     * made with Caption.
     *
     * @param Caption $caption the caption the video will have
     * @see Caption.
     * @return $this
     */
    public function withCaption($caption)
    {
        Type::enforce($caption, Caption::getClassName());
        $this->caption = $caption;

        return $this;
    }

    /**
     * Sets the URL for the video. It is REQUIRED.
     *
     * @param string $url The url of video. Ie: http://domain.com/video.mp4
     *
     * @return $this
     */
    public function withURL($url)
    {
        Type::enforce($url, Type::STRING);
        $this->url = $url;

        return $this;
    }

    /**
     * Sets the aspect ration presentation for the video.
     *
     * @param string $presentation one of the constants ASPECT_FIT, ASPECT_FIT_ONLY, FULLSCREEN or NON_INTERACTIVE
     *
     * @see Video::ASPECT_FIT
     * @see Video::ASPECT_FIT_ONLY
     * @see Video::FULLSCREEN
     * @see Video::NON_INTERACTIVE
     *
     * @return $this
     */
    public function withPresentation($presentation)
    {
        Type::enforceWithin(
            $presentation,
            [
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