|
ISBN refers to an EXACT format, not just revisions, thus the SAME content in Hardback, large print, pocketbook-mass-market, Trade, book club editions, publishers with different geographic limitations, etc will all have different ISBNs.
ISBNs are for ordering a currently available version in a bookshop. It's equivalent to an EAN-UPC for a mythical country called bookland as the first three digits are usually 978 instead of the three digits on EAN-UPC which are a real country code.
The last digit is a check digit.
They work with EAN-UPC POS (Till) systems like in a supermarket or any other non-bookstore.
An identical size and content novel by USA and UK publishers will have a different ISBN, because the digits identifying the supplier/maker/distributor/publisher are after the the country code. Those are a variable number of digits and a supplier/maker/distributor/publisher using ISBN-UPC-EAN may have more than one range purchased at different times.
|