The empty string points probably to a thrown exception, doesn't it? Maybe you should first look for jTidy options for getting the error message to see, ignoring errors or even remove unknown tags.
On a first sight at http://www.w3.org/People/Raggett/tidy/ I found an option "word-2000: bool" for ignoring Word 2000 markup. But of course this does not necessarily mean that jTidy supports it too.
Yes, there is a method Parser.word2000(boolean), but it _ignores_, so passes these tags through, and so I have unbound prefix "o" in my xhtml. This results in errors while building xml later on.
I found a TagSoap project, which fixes input to XML only. It doesn't tidy HTML, but in my case it seems to suit more.
Regards, Marcin Okraszewski
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