<?xml version="1.0"?>
<instances>
        ...
        <instance id="example" ... >
                ...
                <auths>
                        <auth module="userlist">
                                <user user="user1" password="password1"/>
                                <user user="user2" password="password2"/>
                                <user user="user3" password="password3"/>
                        </auth>
                        <auth module="sqlrelay" socket="/tmp/auth.socket" user="auth" password="auth"/>
                        <auth module="userlist">
                                <user user="user4" password="password4"/>
                                <user user="user5" password="password5"/>
                        </auth>
                </auths>
                ...
        </instance>
        ...
</instances>