    <p>If a message is received with the <code>msg.reset</code> property set, the partly complete message is deleted and not sent.
    This resets any part counts.</p>

    <h4>Reduce Sequence mode</h4>
    <p>When configured to join in reduce mode, an expression is applied to each
       message in a sequence and the result accumulated to produce a single message.</p>

    <dl class="message-properties">
        <dt>Initial value</dt>
        <dd>The initial value of the accumulated value (<code>$A</code>)