"The Royal Testament" -

...Also, the Kangxi Emperor's imperial compilation of the Shifu is simply entitled "Shifu," so it is sometimes referred to as just that book (40 volumes, 1715 (Kangxi 54). Also known as "Imperial Fixed Shifu"). Shifu is a form of verse that is sung, but unlike regulated verse and quatrain, the form is determined for each piece of music, so there are as many different forms as there are pieces of music.

*Some of the terminology explanations that refer to the "Royal Testament" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…また康熙帝勅撰の詞譜は単に《詞譜》と題されているので，もっぱらその書を指していうこともある(40巻，1715∥康熙54。《欽定詞譜》とも)。詞は歌辞である一面，定型的韻文であるが，律詩や絶句とは異なり，その定型は楽曲ごとにきまるので，楽曲の数だけ形式の種類があることになる。…

※「《欽定詞譜》」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報