optional, single

—

Inside <built> the shipyard name, and the date of launching are given.

<wreck>

<launchingdate>, <shipyard>

<wreck>

<built>
    <shipyard>Blohm & Voss</shipyard>
    <launchingdate>
        <datetime>1943-06-14</datetime>
    </launchingdate>
</built>