So right now we have china and it refers to the People's Republic of China (PROC)!
I find this a bit wrong, no matter the fact that we'll have a lot more questions about the PROC than the Republic of China (ROC) (taiwan), that the ROC is regarded as a rebel province by the PROC, or that lots of people say "China" when they mean "The People's Republic of China" - just as I do.
Regardless of how people feel about the ROC, we should not assume that "China" is the same as "The People's Republic of China". In fact, "China" refers to both the ancient civilization as well as the geographical area which comprises the territories of both the ROC and PROC.
china should refer to China in general, with a separate tag for the People's Republic of China.
This is based on Should the "Korea" tag redirect to "South Korea"?