reporting-engine/report_xml/demo/report.xml

<?xml version="1.0" encoding="UTF-8" ?>
<odoo>
    <report
        id="demo_xml_report"
        name="report_xml.demo_report_xml_view"
        string="Demo xml report"
        report_type="qweb-xml"
        print_report_name="'Demo xml report'"
        model="res.company"
    />
    <!--
        In case of demo data next definition will not work. So it just example
        how it should look. If report is a part of demo data you will need
        add file to report instance via `post_install_hook`
    -->
    <record id="demo_xml_report" model="ir.actions.report">
        <field name="xsd_schema" type="base64" file="report_xml/demo/demo_report.xsd" />
    </record>
</odoo>