reporting-engine/report_xml/views/report_xml_templates.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
<data>

<template id="utf8_header">
    &lt;?xml version="1.0" encoding="UTF-8"?&gt;
    <grupos t-attf-xmlns="http://www.fundaciontripartita.es/schemas">
        <t t-raw="0"/>
    </grupos>
</template>

</data>
</openerp>