问如何使用saxon s9api以编程方式向节点添加属性？

EN

Processor processor = new Processor(false);
XsltCompiler compiler = processor.newXsltCompiler();
XsltTransformer transformer = compiler.compile(new StreamSource(new File(xlsFilePath))).load();
XdmNode source = processor.newDocumentBuilder().build(new StreamSource(new File(xmlFilePath)));
XdmValue xdmValue = processor.newXPathCompiler().evaluate(xpathExpression, source);
     for (XdmItem xdmItem : xdmValue) {
         XdmNode xdmNode = (XdmNode)xdmItem;

         MutableNodeInfo node = (MutableNodeInfo)xdmNode.getUnderlyingNode();
         NodeInfo nodeInfo = (NodeInfo)xdmNode.getUnderlyingNode().;
         NamePool namePool = ...//retrieve namePoll
         CodedName codedName = new CodedName(node.getFingerprint(), node.getPrefix(), namePool);
         node.addAttribute(codedName, BuiltInAtomicType.UNTYPED_ATOMIC, "1", 0);

         Serializer out = processor.newSerializer(new File(outputFolderPath + xdmNode.getAttributeValue(new QName("id")) +".html"));
         out.setOutputProperty(Serializer.Property.METHOD, "html");
         out.setOutputProperty(Serializer.Property.INDENT, "yes");
         out.setOutputProperty(Serializer.Property.VERSION, "5");
         transformer.setInitialContextNode(xdmNode);
         transformer.setDestination(out);
         transformer.transform();
     }