Triggers the first (and supposedly unique child of this expression) but never wait for its reply (lose it).

A ‘lose’ expression never replies to its parent expression.

    <lose>
        <participant ref="toto" />
    </lose>

Useful only some special process cases (like a concurrence expecting only a certain number of replies).

The brother expressions is ‘forget’, but ‘forget’ triggers its child and immediately replies, whereas ‘lose’ doesn‘t reply.