xmlns:wot="http://xmlns.com/wot/0.1/"
<rdf:Description rdf:about="">
<wot:assurance rdf:resource="my_xml_sig.xml" />
</rdf:Description>
<rdf:Description rdf:about="my_xml_sig.xml">
<wot:signatureType rdf:resource="http://www.w3.org/TR/xmldsig-core/" />
</rdf:Description>