ZCML File
configure.zcml

<configure
    xmlns="http://namespaces.zope.org/browser"
    >
<page
    for="zope.interface.Interface"
    permission="zope.Public"
    name="inner"
    template="inner.pt"
    />
<page
    for="zope.interface.Interface"
    permission="zope.Public"
    name="intermediate"
    template="intermediate.pt"
    />
<page
    for="zope.interface.Interface"
    permission="zope.Public"
    name="outer"
    template="outer.pt"
    />
</configure>