<rules
    xmlns="http://namespaces.plone.org/diazo"
    xmlns:css="http://namespaces.plone.org/diazo/css"
    >

    <theme css:if-content="body.theme1" href="theme1.html"/>
    <theme css:if-content="body.theme2" href="theme2.html"/>
    <copy css:theme="#content" css:content="body > *"/>
</rules>
