<?xml version="1.0"?>
<list string="Activities">
                    <field name="activity_type_id" context="{'form_view_ref': 'mail.mail_activity_type_form_inherit'}"/>
                    <field name="summary" placeholder="e.g. Discuss Proposal"/>
                    <field name="responsible_type"/>
                    <field name="delay_count"/>
                    <field name="delay_unit"/>
                    <field name="delay_from"/>
                </list>
            