[dotNetRDF-Develop] Writing <rdf:about> as RDF/XML format

[<son...@gm...>]

Hi, all

I am trying to write a RDF/XML like follows:
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<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:KB="http://protege.stanford.edu/kb#">
  <KB:EndToEndBlueprintRoot rdf:about="http://protege.stanford.edu/kb#DemoRootImagineID001">
    xxxxx
  </KB:EndToEndBlueprintRoot>
</rdf:RDF>
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Here is my code
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            INode s = g.CreateUriNode("kb:"+"EndToEndBlueprintRoot");
            INode p = g.CreateUriNode("rdf:about");
            INode o = g.CreateUriNode("kb:"+"DemoRootImagineID001");

            g.Assert(new Triple(s,p,o));

            RdfXmlWriter rxw = new RdfXmlWriter();
            string res = VDS.RDF.Writing.StringWriter.Write(g, rxw);
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But only got this
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<rdf:RDF xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" xmlns="http://example.org/" xmlns:a="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:kb="http://protege.stanford.edu/kb#" xmlns:ns0="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"> 
  <rdf:Description rdf:about="&kb;EndToEndBlueprintRoot">
xxx
    <ns3:about xmlns:ns3="http://protege.stanford.edu/system#" rdf:resource="&kb;DemoRootImagineID001" />
  </rdf:Description>
</rdf:RDF> 
-------------------------------------------------------

Is my usage correct? or how can I output the format that I want?
What is the appropriate writing of "rdf:about"?

Any suggestion will be appreciated!





son...@gm...