shows how the XmlQuerySetChain can be used instead of @toxml decorator

def chain(request):
    """shows how the XmlQuerySetChain can be used instead of @toxml decorator"""
    bars = foobar_models.Bar.objects.all()
    bazs = foobar_models.Baz.objects.all()
    qsc = XmlQuerySetChain(bars, bazs)
    return HttpResponse(tree.xml(qsc), mimetype='text/xml')