<?xml version="1.0" encoding="utf-8" ?>
<DecMessage xmlns="http://www.chinaport.gov.cn/dec_3_1">
    <Users>
        <user id="${user.id}">
            <id>${user.id!}</id>
            <username>${user.username!}</username>
            <address>${user.address!}</address>
            <#list user.u as u>

            </#list>
            <
        </user>
    </Users>
</DecMessage>