<?xml version="1.0"?>
<data><xpath expr="//field[@name='email']" position="before">
                    <field name="is_blacklisted" invisible="1"/>
                    <button name="mail_action_blacklist_remove" class="fa fa-ban text-danger" title="This email is blacklisted for mass mailings. Click to unblacklist." type="object" context="{'default_email': email}" groups="base.group_user" invisible="not is_blacklisted"/>
                </xpath>
                <xpath expr="//sheet" position="after">
                    <chatter/>
                </xpath>
            </data>