Is it possible to whitelist tags?

I'm developing an application using TidyLib and C++. I want to tidy up
certain HTML code, but I want to whitelist certain tags. e.g. I would
only like to allow <strong>, <ul>, and <li>, but not <table>, <tr>,
<td>, <script>, and so forth.

If that isn't possible, would it be possible to do some kind of
blacklisting instead?

Also, one last question: Is it possible to use a similar mechanism to
whitelist/blacklist attributes on particular properties? For example,
I might want to allow the attribute "name", but not the attribute
"class" for "input" tags. How would one go about doing that?

Thank you a lot in advance,
Dionysis.