which HTML?

Susan Korgen <[email protected]>
Newsgroups gmane.comp.web.html-tidy.user
Message-ID <[email protected]>
How do you tell Tidy which HTML you want: Strict, Basic, XHTML vs. HTML etc.?
Is there a configuration setting that you can use to identify a DTD?
Can you specify your own (more restrictive) DTD?
Sorry to ask but this was not obvious from the site 
http://www.w3.org/People/Raggett/tidy/
Thanks!
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