code: public void addRdfDescription(String xmlns, String content) throws IOException {
  		writer.write("<rdf:Description rdf:about=\"");
  		writer.write(about);
  		writer.write("\" ");
  		writer.write(xmlns);
  		writer.write(">");
  		writer.write(content);
  		writer.write("</rdf:Description>\n");
  	}
docs: Adds an rdf:Description.
  @param xmlns
  @param content
  @throws IOException