XElement를 사용하여 네임스페이스와 접두사가 있는 XML 문서를 만드는 방법은 무엇입니까?

XNamespace ns = "http://url/for/sphinx";

XElement element = new XElement(ns + "docset");

XNamespace ns = XNamespace.Get("http://url/for/sphinx");
XElement element = new XElement(ns.GetNamespacePrefix() + "docset");

XNamespace ns = "http://url/for/sphinx";
XElement container = new XElement("container",
    new XAttribute(XNamespace.Xmlns + "sphinx", ns),
    new XElement(ns + "docset",
        new XElement(ns + "schema"),
            new XElement(ns + "field", new XAttribute("name", "subject")),
            new XElement(ns + "field", new XAttribute("name", "content")),
            new XElement(ns + "attr", 
                         new XAttribute("name", "published"),
                         new XAttribute("type", "timestamp"))));

<container xmlns:sphinx="http://url/for/sphinx">
  <sphinx:docset>
    <sphinx:schema />
    <sphinx:field name="subject" />
    <sphinx:field name="content" />
    <sphinx:attr name="published" type="timestamp" />
  </sphinx:docset>
</container>