Could tidy handle an unknown tag?

"chendong陈冬" <[email protected]> Sun, 27 May 2007 21:33:14 +0800

Newsgroups	gmane.comp.web.html-tidy.user
Message-ID	<[email protected]>

for example:
in baidu.zhidao.com, the HTML contains some kinds of use-defined tag, <ca>
<cq> <cd>，
after tidy deal with it, the use-defined tag lost, but i want to keep it.
who can tell me how?
3xs!!!

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