optional, single

—

The serial number of an part of equipment.

<boots>, <buoyancycontroldevice>, <camera>, <compass>, <compressor>, <divecomputer>, <fins>, <gloves>, <knife>, <lead>, <light>, <mask>, <rebreather>, <regulator>, <scooter>, <suit>, <tank>, <variouspieces>, <videocamera>, <watch>

—

the elements listed under parent elements

(e.g. see also <buoyancycontroldevice>)

<serialnumber>192837465</serialnumber>