public function normalize(
        Content $content,
        ThemeInterface $theme,
        TemplateInterface $template,
        ZoneInterface $zone,
        ComponentInterface $component
    ) {
        return array('_s_context' => array(
            'content' => array($content->getType()->getName(), $content->getContentId()),
            'theme' => $theme->getName(),
            'template' => $template->getId(),
            'zone' => $zone->getId(),
            'component' => $component->getId(),
        ));
    }