java解析xml的疑问
XML：
<?xml version="1.0" encoding="ISO-8859-1"?>
<bookstore>
<book category="COOKING">
<title lang="en">Everyday Italian</title>
<author>Giada De Laurentiis</author>
<year>2005</year>
<price>30.00</price>
</book>
<book category="XXXX">
<title lang="en2">Learning XML2</title>
<author>Erik T. Ray2</author>
<year>20032</year>
<price>39.952</price>
</book>
</bookstore>
Java：
public static void readXML2(String xmlFile) {
try {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(xmlFile);
Element root = doc.getDocumentElement();// root 指向bookstore节点
NodeList nls = root.getChildNodes();// nls指向bookstore的子节点book
System.out.println(nls.getLength());
为什么输出的长度是5呢？不是很明白。
另外如果是这样的xml：
<?xml version="1.0" encoding="ISO-8859-1"?>
<bookstore>
<book category="COOKING">
<title lang="en">Everyday Italian</title>
<author>Giada De Laurentiis</author>
<year>2005</year>
<price>30.00</price>
</book>
<book category="XXXX">
<title lang="en2">Learning XML2</title>
<author>Erik T. Ray2</author>
<year>20032</year>
<price>39.952</price>
<book category="ddddd">
<title lang="en3">Learning XML3</title>
<author>Erik T. Ray3</author>
<year>20033</year>
<price>39.95</price>
</book>
</book>
</bookstore>
试了网上的几个解析方法，基本都会将<book category="ddddd">这个下面的内容丢掉，
这个不是很合理的xml该如何解析？
谢谢
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