Over on main we had a question: " pstricks and beamer compilation with xelatex results in xkeyval error " and the questioner requested the xkeyval be created and placed on his question.
Following the philosophy outlined in Our set of tags I went ahead and did that. It says packages and classes should get their own tags. xkeyval is a pretty big package and despite the fact that we have had no questions about it yet I think it's merited.
What say you, metafolk? Is the linked meta post still policy?
As it turned out the question was unrelated to the use of xkeyval; that was just the package that threw the error (it was a symptom, not a cause). So I detagged the question and xkeyval is currently an orphan.