XML与CSS类选择符的使用

Class.xml

<?xml version="1.0" encoding="utf-8"?><?xml-stylesheet type="text/css" href="class.css"?><bookdetail><book class="A"><author>曹雪芹</author><title>红楼梦</title><price>60.00</price></book><book class="A"><author>罗贯中</author><title>三国演义</title><price>40.00</price></book><book class="M"><author>琼瑶</author><title>一帘幽梦</title><price>20.00</price></book></bookdetail>

Class.css

@charset "utf-8";/* CSS Document */bookdetail{display:block}book.a{color:blue;}book{display:block}price{font-style:italic}