为什么CDATA里可以嵌套 ???

[smartcatiboy]

到处说xml里的![CDATA[ ]]不能嵌套，但是为啥csdn可以用？？

我测试了一下，防]]efasdfasfd[![CDATA这样的内容也可以正常解析??

不是说会产生错误吗？？

[smartcatiboy]

..

[smartcatiboy]

再测试一下,以下为嵌套代码
]]>
</Content>
<PostDateTime>2007-1-19 1:19:56</PostDateTime>
<Reply>
<PostUserNickName>不再言爱</PostUserNickName>
<rank>二级(初级)</rank>
<ranknum>user2</ranknum>
<credit>100</credit>
<ReplyID>38963299</ReplyID>
<TopicID>5302460</TopicID>
<PostUserId>1081572</PostUserId>
<PostUserName>hzl126</PostUserName>
<Point>0</Point>
<Content>
<![CDATA[
afefasdfasf,,,<<>>>efasdf
aa

[zzhzzh204553]

]]>
</Content>
<PostDateTime>2007-1-19 1:19:56</PostDateTime>
<Reply>
<PostUserNickName>不再言爱</PostUserNickName>
<rank>二级(初级)</rank>
<ranknum>user2</ranknum>
<credit>100</credit>
<ReplyID>38963299</ReplyID>
<TopicID>5302460</TopicID>
<PostUserId>1081572</PostUserId>
<PostUserName>hzl126</PostUserName>
<Point>0</Point>
<Content>
<![CDATA[
afefasdfasf,,,<<>>>efasdf
aa

[出家人专度女施主]

什么叫嵌套