contain.pp

class site::motd($template = 'site/motd') {
  notify { 'motd': message => "template is $template" }
}

class goal {
  notify { "site::motd::template":
    message => "::site::motd::template is ${::site::motd::template} (should be ${::node_template})"
  }
}

class container {
  include('site::motd')
}

node default {
  $node_template = 'site/motd.jeff'
  class { 'container': }
  -> class { 'goal':}

  class { 'site::motd': template => $node_template }
}