see also: http://trehn.com/2009/04/30/turbocharging-bcfg2/

foobar.newtxt

I am a file at /tmp/${x} and the magic number is ${z}

mybundle.genshi

<Bundle name="mybundle" xmlns:py="http://genshi.edgewall.org/" xmlns:xi="http://www.w3.org/2001/XInclude">
  <py:for each="x in y">
    <?python z = 5 ?>
    <BoundPath type="file" name="/tmp/${x}" owner="root" group="root" perms="0644"><xi:include parse="text" href="foobar.newtxt" /></BoundPath>
  </py:for>
</Bundle>