怎么生成一个树型结构的XML文件？
UserID ChildID ParentID
1 1 null
2 2 1
3 3 1
4 4 2
5 5 2


数据库的结构是这样的，我现在怎样才能写成一个树型结构的ＸＭＬ文件啊？

[解决办法]
select sys_connect_by_path(parentID, '/ ') || '/ ' || childID
from userTable
start with parentID is null
connect by parentID = prior childID
[解决办法]
then generate the xml file by the selected result
[解决办法]
代范例可以照：http://www.codeproject.com/aspnet/SquaredRomiss.asp