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java怎样用dom修改xml元素名或者属性名

xml 文件:
<?xml version="1.0" encoding="GB2312"?> 

<?xml-stylesheet type="text/xsl" href="students.xsl"?>

<students>
  <student sn="01">
  <name>张三</name>
  <age>18</age>
  </student>
   
  <student sn="02">
  <name>李四</name>
  <age>20</age>
  </student>
</students>

我想改成: 把age 改成score
<?xml version="1.0" encoding="GB2312"?> 

<?xml-stylesheet type="text/xsl" href="students.xsl"?>

<students>
  <student sn="01">
  <name>张三</name>
  <score>18</score>
  </student>
   
  <student sn="02">
  <name>李四</name>
  <score>20</score>
  </student>
</students>

或者把属性sn 改成 id ,如:
<?xml version="1.0" encoding="GB2312"?> 

<?xml-stylesheet type="text/xsl" href="students.xsl"?>

<students>
  <s


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