Monachus

*** OLD WAY ***

node basenode {
  include global::test
}

node node1 inherits basenode {
  $mta = "postfix"

  include global::test2
}

class global::test {
  notice("$mta: ${mta}")  ## $mta is unset
}

class global::test2 {
  notice("$mta: ${mta}")  ## $mta == 'postfix'
}


*** NEW WAY ***

node basenode {
  # ONLY USED TO SET DEFAULT VARIABLES
  $mta = "exim4"

}

node node1 inherits basenode {
  $mta = "postfix"

  include global::base
  include global::test2
}

class global::base {
  # USED TO INCLUDE CLASSES _AFTER_ VARIABLES/TAGS HAVE BEEN SET FOR NODES
  include global::test
}

class global::test {
  notice("$mta: ${mta}")  ## $mta == 'postfix' for node1, and 'exim4' for anything else
}

class global::test2 {
  notice("$mta: ${mta}")  ## $mta == 'postfix'
}