可以在xml中自己数子节点嘛？

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

<bookstore>

<book id="1">

<name>人生</name>

<author>路遥</author>

<year>2014</year>

<price>89</price>

</book>

<book id="2">

<name>家</name>

<year>2004</year>

<price>77</price>

<language>中文</language>

</book>

</bookstore>

 教程说book1有九个子节点，哪九个？