The identifying number and/or name assigned to the state or edition of a work that exists in more than one form and the placement of that work in the context of prior or later issuances of multiples of the same work. For published volumes, such as books, portfolios, series, or sets, the edition is usually expressed as a number in relation to other editions printed. In other cases, a scholar may have identified a series of editions, which have then been numbered sequentially. An state or edition may also be identified by a name or phrase. If the data is derived