 This type of dictionary, which focuses on the shape and structure of the characters, subsumes both "orthography dictionaries", such as the "Ganlu Zishu" (干祿字書) of the Tang Dynasty, and "script dictionaries", such as the "Liyun" (隸韻) of the Song Dynasty.Although these dictionaries center upon the graphic properties of Chinese characters, they do not necessarily collate characters by radical.For instance, "Liyun" is a clerical script dictionary collated by tone and rime.