<head>
{% for item in seq %}
<!-- meta for {{item}} -->
{% set key, value = call(item) %}
<meta name="{{key}}" content="{{value}}">
{% endfor %}
</head>
<body>
{%set navigation = [('index.html', 'Index'), ('about.html', 'About')] %}
{% set navigation %}
<li><a href="/">Index</a></li>
<li><a href="/downloads">Downloads</a></li>
{% endset %}
</body>