<?xml version="1.0"?>
<data><xpath expr="//field[@name='is_connected']" position="before">
                <field name="mobile" invisible="1"/>
            </xpath>
            <xpath expr="//button[@name='action_send_mail']" position="after">
                <button name="action_send_sms" type="object" icon="fa-mobile" attrs="{'invisible': [('mobile', '=', False)]}" string="SMS"/>
            </xpath>
        </data>