Brackets and flying commas: UDC in Tate Library

Universal Decimal Classification (UDC) is a flexible classification scheme that allows the full expression of the subject of a book. However such flexibility requires decisions to be taken on how to apply and use the schedules. This article discusses the choices made by Tate Library in its implementation of the classification scheme and how the Library has developed UDC for its in-house use, in particular the expansion of the section for modern art.