<?xml version="1.0"?>
<search>
            <field name="model" filter_domain="[('model','=', self)]" string="Model"/>
            <group expand="0" string="Group By" colspan="4">
                <filter string="Model" name="page_model" domain="[]" context="{'group_by':'model'}"/>
                <filter string="Website" name="page_website_id" domain="[]" context="{'group_by':'website_id'}"/>
            </group>
        </search>
    