public function make( $type )
    {
        $type = __NAMESPACE__ . "\\" . $type;
        if (class_exists( $type )) {
            /**
             * @var \Lti\Seo\Generators\Thing $object
             */
            $object = new $type( $this->helper );
            $result = $object->format();
            if (is_array( $result ) && ! empty( $result )) {
                return json_encode( array_merge( array( '@context' => 'http://schema.org' ), $result ) );
            }
        }

        return null;
    }