<fr:buttons>
    <fr:button xxforms:modal="true"
               ref=".[instance('fr-form-instance')/internal/part != 'confirmation']">
        <xforms:label>
            <xhtml:img width="16" height="16"
                       src="/apps/fr/style/images/pixelmixer/right_16.png" alt=""/>
            <xhtml:span>Next</xhtml:span>
        </xforms:label>
        <xforms:setvalue ev:event="DOMActivate" ref="instance('fr-form-instance')/internal/part"
                         value="
                             if (. = 'personal') then
                                 if (instance('fr-form-instance')/personal/need-hotel = 'true')
                                 then 'hotel' else 'confirmation'
                             else if (. = 'hotel') then
                                 'confirmation'
                             else ''"/>
    </fr:button>
</fr:buttons>