However, in diplomatic documents and so on, 'Nihonkoku Kotei' (Emperor of Japan) was used afterwards, too, and several similar expressions can be found in official domestic documents, also (look at 'Nihonkoku Kotei' for the usage of the expression).
ただし、外交文書などではその後も「日本国皇帝」が多く用いられ、国内向けの公文書類でも同様の表記が何点か確認されている（用例については別項「日本国皇帝」を参照）。