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 %hash = (
  'nmis' => {

    # Different rules can be defined for when an NMIS node is created and when
    # it is updated. This lets you avoid overwriting values the you edit in NMIS.
    'create' => {

      # version will resolve to the 'os_version' field in the device if it exists, or
      # an empty string otherwise.
      'version' => ['$DEVICE.os_version'],

      # roleType and group try to use a value from the device if it exists, but
      # will fall back to a constant if it does not.
      'roleType' => ['$DEVICE.nmis_role', 'core'],
      'group' => ['$DEVICE.nmis_group', 'Open-AudIT'],

      # host checks multiple fields from the device, choosing the first one
      # that has a value (or the empty string if no values are found).
      'host' => ['$DEVICE.ip', '$DEVICE.hostname','$DEVICE.dns_hostname', '$DEVICE.fqdn'],

      # active, ping, and model just use a default value when any new node is created.
      'active' => ['true'],
      'ping' => ['true'],
      'model' => ['automatic'],
 
      # name uses an array of candidates like all the other fields, but it also applies
      # a set of transform functions after a candidate is chosen.
      'name' => {
        'candidates' => ['$DEVICE.name'],
        'transforms' => ['trim_whitespace'],
      }
    },

    # Only the node fields defined here will be considered for an update.
    'update' => {

      'roleType' => ['$DEVICE.nmis_role', 'core'],
      'group' => ['$DEVICE.nmis_group', 'Open-AudIT'],

    }
  }
);