     <xf:instance id="first-uuid">
                <uuid/>
            </xf:instance>

            <xf:submission id="request-submission" serialization="none" method="get" resource="/xforms-sandbox/service/uuid"
                           replace="instance" instance="response" xxf:readonly="true" xxf:cache="true"/>

            <xf:action ev:event="xforms-model-construct-done">
                <xf:send submission="request-submission"/>
                <xf:setvalue ref="instance('first-uuid')" value="instanc