<?xml version="1.0"?>
<search>
                    <field name="name" filter_domain="['|', '|', ('summary', 'ilike', self), ('shortdesc', 'ilike', self), ('name', 'ilike', self)]" string="Theme"/>
                    <field name="category_id" filter_domain="['|', '|', ('summary', 'ilike', self), ('shortdesc', 'ilike', self), ('category_id', 'ilike', self)]" string="Category"/>
                    <group>
                        <filter string="Author" name="author" domain="[]" context="{'group_by':'author'}"/>
                        <filter string="Category" name="category" domain="[]" context="{'group_by':'category_id'}"/>
                    </group>
                </search>
            