关于生成XML的问题

我通过一个方法获得相应的参数，我想通过这些参数生成一个XML，如：<?xml version="1.0" encoding="GB2312"?>
<DOC_APPROVEINFO>
<WORKFLOWNODE  NODENAME="开始" >
 <WORKFLOWINFOS NAME="count" VALUE="1">
   <WORKFLOWINFO  NAME="time" VALUE="2008-07-22 09:00:10"/>
   <WORKFLOWINFO NAME="person" VALUE="zhangsan"/>
   <WORKFLOWINFO NAME="idea" VALUE="OK"/>
</WORKFLOWINFOS>
</WORKFLOWNODE >
    
<WORKFLOWNODE  NODENAME="结束"/>
 <WORKFLOWINFO  NAME="count" VALUE="1">
   <WORKFLOWINFO  NAME="time" VALUE="2008-07-22 09:00:10"/>
   <WORKFLOWINFO NAME="person" VALUE="zhangsan"/>
   <WORKFLOWINFO NAME="idea" VALUE="OK"/>
     </WORKFLOWINFO>
     <WORKFLOWINFO NAME="count" VALUE="2">
   <WORKFLOWINFO  NAME="time" VALUE="2008-07-22 09:00:10"/>
   <WORKFLOWINFO NAME="person" VALUE="zhangsan"/>
   <WORKFLOWINFO NAME="idea" VALUE="OK"/>
      </WORKFLOWINFO>
      <WORKFLOWINFO NAME="count" VALUE="3">
   <WORKFLOWINFO  NAME="time" VALUE="2008-07-22 09:00:10"/>
   <WORKFLOWINFO NAME="person" VALUE="zhangsan"/>
   <WORKFLOWINFO NAME="idea" VALUE="OK"/>
      </WORKFLOWINFO>
</WORKFLOWNODE >
请问我如何生成，谢谢大家了