Un ejemplo de código

este ejemplo es muy sencillo...

<?xml version="1.0" encoding="utf-8"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
         xmlns:earl="http://www.w3.org/WAI/ER/EARL/nmg-strawman#">
  <earl:Assertion>
    <earl:subject rdf:resource="#http://www.w3.org/" />
    <earl:result rdf:type"http://www.w3.org/WAI/ER/EARL/nmg-strawman#Pass"/>
    <earl:testcase rdf:resource="http://example.org/1999/xhtml#transitional"/>
    <earl:assertedBy rdf:resource="http://validator.w3.org" />
    <earl:mode rdf:resource="http://www.w3.org/WAI/ER/EARL/nmg-strawman#automatic"/>
    <earl:message xml:lang="es">Esta pagina es XHTML valido</earl:message>
  </earl:Assertion>
</rdf:RDF>