jdom如何生成名字空间,用JDOM生成头注释的问题

<manifest  
  xmlns="http://www.open.net/main"    
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
  xsi:schemaLocation="http://www.open.net/main   http://schemas.open.net/sys.xsd">  
   
  对于前两个名字空间我用如下代码实现了  
  Element   root=new   Element("mainifest");  
  Document   doc=new   Document(root);  
  root.setNamespace(Namespace.getNamespace("","http://www.open.net/main"));  
  root.addNamespaceDeclaration(Namespace.getNamespace("xsi","http://www.w3.org/2001/XMLSchema-instance"));  
   
  对于第三个名字空间xsi:schemaLocation="http://www.open.net/main   http://schemas.open.net/sys.xsd"用jdom如何写呢？？

Element   root=new   Element("mainifest");  
  Document   doc=new   Document(root);  
  root.setNamespace(Namespace.getNamespace("","http://www.open.net/main"));  
   
  NameSpace   ns=Namespace.getNamespace("xsi","http://www.w3.org/2001/XMLSchema-instance");  
  root.addNamespaceDeclaration(ns);  
  root.addAttribute(new   Attribute("schemaLocation","http://www.open.net/main   http://schemas.open.net/sys.xsd",ns));//第3个是属性，使用上面声明的NameSpace  

<?xml version="1.0" encoding="UTF-8"?>
<!-- edited with XMLSpy v2005 rel. 3 U ( http://www.altova.com) by () -->
<!--Sample XML file generated by XMLSpy v2005 rel. 3 U ( http://www.altova.com)-->
<root>
</root>

method1:

   doc = new Document();//先ＮＥＷ一个然后才能ＡＤＤ
   doc.addContent(new Comment("edited with XMLSpy v2005 rel. 3 U (http://www.altova.com) by  ()"));
   doc.addContent(new Comment("Sample XML file generated by XMLSpy v2005 rel. 3 U (http://www.altova.com)"));
method2:

Document doc = new Document();／／先ＮＥＷ一个然后才能ＡＤＤ
Comment c1 = new Comment("edited with XMLSpy v2005 rel. 3 U ( http://www.altova.com) by ()");
Comment c2 = new Comment("Sample XML file generated by XMLSpy v2005 rel. 3 U ( http://www.altova.com)");
Collection c = new ArrayList();
c.add(c1)；
c.add(c2);
doc.addContent(c);
Element root = new Element("root");
doc.setRootElement(root);
Format format = Format.getPrettyFormat();
XMLOutputter output = new XMLOutputter(format);
System.out.println(output.outputString(doc));