I read page https://confluence.ez.no/display/EZP/Legacy+code+and+features

So, I run a page with non legacy siteaccess.

My template:

{% block content %}
    {{ render( url('content/view/sitemap/2') ) }}
{% endblock %}

When running page,the error appeared:

An exception has been thrown during the rendering of a template ("None of the chained routers were able to generate route: Route 'content/view/sitemap/2' not found" in TmnTgkmBundle::legacy.html.twig at line 5.

Some information:

• My controller inherits eZ\Bundle\EzPublishCoreBundle\Controller
• My action function very simple:

public function homeAction()
{
    return $this->render( "TmnTgkmBundle::legacy.html.twig" );
}

My question is why sub-request {{ render( url('content/view/sitemap/2') ) }} don't work ? Is the documentation written in principle, not in practice ?