Element root=new Element("mainifest");
Document doc=new Document(root);
 root.setAttribute(new Attribute("identifier", "MANIFEST1"));
root.setNamespace(Namespace.getNamespace("","http://www.imsglobal.org/xsd/imscp_v1p1"));
root.addNamespaceDeclaration(Namespace.getNamespace("imsmd","http://www.imsglobal.org/xsd/imsmd_v1p2"));
root.addNamespaceDeclaration(Namespace.getNamespace("xsi",""http://www.w3.org/2001/XMLSchema-instance"));最后一个xsi:schemaLocation 怎么写我也不清楚