<?xml version="1.0"?>
<data><xpath expr="//field[@name='country_id']" position="after">
                <field name="campaign_id"/>
                <field name="mass_mailing_id"/>
            </xpath>
            <xpath expr="//filter[@name='groupby_country_id']" position="after">
                <filter string="Mass Mailing" name="groupby_mass_mailing_id" context="{'group_by': 'mass_mailing_id'}"/>
            </xpath>
        </data>