I know that you use a restrictive adjective clause when you refer to a proper noun.
- ex) Horyuji, which is the oldest building in Japan, was built more than 1000 years ago.
However, should I use a restrictive clause or an unrestrictive clause in the sentence below?
- Horyuji is Japan's oldest building which was built more than 1000 years ago.
There is no other "Japan's oldest building" aside from Horyuji. Do you need to use an unrestrictive clause in this case?