it is a Error?

report=When I Submitted this example: 

<?xml version="1.0"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
 xmlns:dc="http://purl.org/dc/elements/1.1/">
 <rdf:Description rdf:about="http://www.w3.org/">
   <dc:title rdf:datatype="http://www.w3.org/1999/02/22-rdf-syntax-ns#langString" xml:lang="en">World Wide Web Consortium</dc:title> 
 </rdf:Description>
</rdf:RDF>

"Triples of the Data Model" doesn't show me the language "en". This is a error?

RDF=<?xml version="1.0">
<?xml version="1.0"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
 xmlns:dc="http://purl.org/dc/elements/1.1/">
 <rdf:Description rdf:about="http://www.w3.org/">
   <dc:title rdf:datatype="http://www.w3.org/1999/02/22-rdf-syntax-ns#langString" xml:lang="en">World Wide Web Consortium</dc:title> 
 </rdf:Description>
</rdf:RDF>