<?xml version="1.0"?>
<tree string="Tracking Value">
                    <field name="field"/>
                    <field name="old_value_integer"/>
                    <field name="old_value_float"/>
                    <field name="old_value_char"/>
                    <field name="old_value_text"/>
                    <field name="old_value_datetime"/>
                    <field name="new_value_integer"/>
                    <field name="new_value_float"/>
                    <field name="new_value_char"/>
                    <field name="new_value_text"/>
                    <field name="new_value_datetime"/>
                    <field name="mail_message_id"/>
                </tree>
            