rt/ws/policy/src/test/resources/samples/test19.xml

<?xml version="1.0"?>
<wsp:Policy xmlns:wsp="http://schemas.xmlsoap.org/ws/2004/09/policy">
    <!-- 1N -->
    <wsp:ExactlyOne>
        <wsp:All/>
    </wsp:ExactlyOne>
</wsp:Policy>