郑樵《通志·校雠略》“书有名亡实不亡论”云:“……李舟《切韵》乃取《说文》而分声,《天宝切韵》即《开元文字》而为韵,《内外转归字图》、《内外转钤指归图》、《切韵枢》之类无不见于《韵海镜源》。……”有的学者据此认为《韵海镜源》是比较可靠的早期韵图形式,把《韵镜》类韵图的产生时间上推到中唐时期。对此提出质疑。 Zheng Qiao, “Tongzhi school 雠 slightly” “book nameless extinction ” cloud: “... ... Li Zhou” cut rhyme “is to take” said the text “and points,” Tianbao Qiyun “ New Year’s words ”and rhyme,“ inside and outside the transition to the word map ”,“ inside and outside the transition refers to the map ”,“ cut rhyme pivot ”and the like are seen in“ Yunhai mirror source. ”“ Some scholars think ”Yunhai mirror source“ is a more reliable early rhyme pattern, the ”rhyme mirror" rhyme figure generation time pushed up to the middle period of the Tang Dynasty. Queries on this.