java 解析 <description />这种XML节点

如题，
遇到这种节点应该怎么解析呢，我的部分代码如下。怎么在这上面改改就能用呢
Java code:

for(int i = 0; i < childNodes.getLength(); i++ ){
Node childNode = childNodes.item(i);
if( childNode instanceof Element ) {
System.out.println("the name is "+childNode.getNodeName()+" the value is "+childNode.getFirstChild().getNodeValue());
}
}



相应的XML文件，部分
XML code:

<?xml version="1.0" encoding="UTF-8"?>
<orgdata>
<participants>
<participant id="PA-89be9dfd-b389-4550-8170-aba4930abc36">
<userid>exec_producer</userid>
<password>bUlBkHMDhGQMFWNZUYdBGwmcoqQ=</password>
<firstname>Alan</firstname>
<lastname>Lee (executive producer)</lastname>
<description />
<notes />
<isAdministrator>false</isAdministrator>
<isAvailable>true</isAvailable>
<roles>
<role>RO-55ed22a1-b494-42b7-9103-c16ce4f9b46d</role>
</roles>
<positions />
<capa