 Although there is little direct evidence that any classical text exerted an important influence on urban design until the late imperial period, the texts themselves have a much longer history.While some important literary evidence concerning Zhou urban construction can be found in the "Classic of Poetry" and the "Book of Documents", during the Han dynasty a text emerged that would later become the "locus classicus" of the ideal imperial capital.This text, "The Artificer’s Record", is a description of craftsmen’s techniques that includes two sections on city construction.