standard.pp

class profile::standard (
    Boolean $has_default_mail_relay = lookup('profile::standard::has_default_mail_relay', {'default_value' => true}),
    Boolean $has_admin              = lookup('profile::standard::has_admin',              {'default_value' => true}),
) {
  class {'standard':
    has_default_mail_relay => $has_default_mail_relay
    has_admin              => $has_admin
  }
}