Taiwan is still officially "The Republic of China" I believe
the DDR/BDR isn't really the same as neither side claimed to "own" or represent the other
A more interesting example is the Republic of Ireland and N Ireland where the Republic issues passports to N Irish citizens (but not vice-versa) and
"
Article 3.1 of the Constitution of Ireland "recognises that a united Ireland shall be brought about only by peaceful means with the consent of a majority of the people, democratically expressed, in both jurisdictions in the island".[This provision was introduced in 1999 after implementation of the Good Friday Agreement, as part of replacing the old Articles 2 and 3, which had laid a direct claim to the whole island as the national territory"
which wasn't that different to the Chinese position on Taiwan until Xi took out Hong Kong and whipped up the current storm.[size=8333px] [/size]