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<?xml version="1.0" encoding="UTF-8"?> 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "DTD/xhtml1-s
+trict.dtd"> 
...
        <P>Oops - XHTML tags must be in lower case</p> 
    </body> 
</html>

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% tidy -e test.html
Info: Doctype given is "-//W3C//DTD XHTML 1.0 Strict//EN"
...
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