有关XML中显示的错误 - Web 开发 / XML/SOAP

今天做了一个用CSS,XSL样式表显示XML文档的东西，结果是出来了，但是，不太对劲啊，有一列对不上，找了半天也没找出错误来，希望大家帮忙看一下，旁观者清嘛，在这里谢谢大家了。具体代码如下：
(1)student.xml

<?xml version="1.0" encoding="UTF-8"?>
<?xml:stylesheet type="text/xsl" href="student.xsl" ?>
<roster>
<student ID="s101">
<name>李华</name>
<sex>男</sex>
<birthday>1978.9.12</birthday>
<score>92</score>
<skill>Java</skill>
<skill>Oracle</skill>
<skill>C Sharp</skill>
<skill>SQL Server</skill>
</student>
<student ID="s102">
<name>倪冰</name>
<sex>女</sex>
<birthday>1979.1.12</birthday>
<score>89</score>
<skill>Visual Basic</skill>
<skill>SQL Server</skill>
<skill>ASP</skill>
</student>
<student ID="s103">
<name>张君宝</name>
<sex>男</sex>
<birthday>1982.9.9</birthday>
<score>100</score>
<skill>C Sharp</skill>
<skill>SQL Server</skill>
<skill>UML</skill>
</student>
<student ID=&q