src/Facebook/InstantArticles/Elements/Author.php [57:83]:
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    private function __construct()
    {
    }

    /**
     * Creates an Author instance.
     *
     * @return Author
     */
    public static function create()
    {
        return new self();
    }

    /**
     * Defines the link URL for the author
     *
     * @param string $url the URL link for author. Ex: "http://facebook.com/everton.rosario"
     *
     * @return $this
     */
    public function withURL($url)
    {
        Type::enforce($url, Type::STRING);
        $this->url = $url;

        return $this;
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src/Facebook/InstantArticles/Elements/RelatedItem.php [29:55]:
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    private function __construct()
    {
    }

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

    /**
     * Sets the article URL
     *
     * @param string $url The related article URL
     *
     * @return $this
     */
    public function withURL($url)
    {
        Type::enforce($url, Type::STRING);
        $this->url = $url;

        return $this;
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