Inside <shipdimension> the technical data of a ship, or wreck respectively, are given.
If <shipdimension> is given, at least one of its child elements must
be given, too.
(see also <wreck>, or
<vessel>)
<shipdimension>
<length>156.2</length>
<beam>12.6</beam>
<draught>5.7</draught>
<displacement>123456.7</displacement>
<tonnage>170000.0</tonnag>
</shipdimension>