<!-- Battery -->
<element name="battery" required="*">
  <description>Description of a battery.</description>

  <attribute name="name" type="string" default="__default__" required="1">
    <description>Unique name for the battery.</description>
  </attribute>

  <element name="voltage" type="double" default="0.0" required="1">
    <description>Initial voltage in volts.</description>
  </element>
</element>
