<?xml version="1.0" encoding="UTF-8"?>

<bookstore>

<!-- 中文书本信息 -->

<book>

<title lang="cn">Java并发编程实战</title>

<author>Brian Goetz / Tim Peierls / Joshua Bloch / Joseph Bowbeer / David Holmes / Doug Lea</author>

<year>2012</year>

<price>69</price>

</book>

<!-- 英文书本信息 -->

<book>

<title lang="en">Java Concurrency in Practice</title>

<author>Brian Goetz / Tim Peierls / Joshua Bloch / Joseph Bowbeer / David Holmes / Doug Lea</author>

<year>2006</year>

<price>59.99</price>

</book>

<book>

<title lang="de">德文书</title>

<author>德国</author>

<year>2014</year>

<price>50</price>

</book>

<book>

<title>没有lang属性</title>

<author>试试</author>

<year>2016</year>

</book>

</bookstore>