ec2stack/templates/response.xml (7 lines of code) (raw):
<?xml version="1.0" encoding="UTF-8"?>
<{{response_type}}{% if not error %} xmlns="http://ec2.amazonaws.com/doc/{{api_version}}/"{%endif%}>
{% block response_content %}{% endblock %}
{% if request_id %}
<RequestId>{{request_id}}</RequestId>
{% endif %}
</{{response_type}}>