Using Related Products and other Identifiers
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What's an Edition anyway?
Edition is one of those terms that can mean a lot within publishing – that book on the table can be called an edition – but in metadata the meaning of Edition should be specific and the Related Product composite plays a big part in it's use.
When a publisher creates an "edition" that deserves mention in metadata as an Edition they've changed the content of something in one of their published books in some substantive way and issued it under a new ISBN. There's an old product and a new and likely improved product. In a few special cases Edition is used to show some special market or limit in the supply chain: "Large Type" or "Ultra Large Type" are considered "Edition Codes" in metadata (a special market) and so are books that are published initially as "digital editions" without any print counterpart (atypical supply).
Let's start with the typical case in publishing: All formats – hardcover, paperback, digital, etc. -- that share the same text or text-and-illustration combination are "identical content" and are considered to be of the same "Edition." Or to state that another way: By far the vast majority of books published come out in a single original edition and are only available in multiple formats. In good ONIX metadata these are identified by the <NoEdition /> tag which very accurately says what it means: Don't go looking for "edition" related information about this book because it doesn't exist. You can improve the metadata entry by providing a "Work Identifier" that shows all these entries are, indeed, the same content – and the "persistent" identifier to improve discoverability would be an ISTC. All publishers should use at least a proprietary Work Identifier and if you must use an ISBN (usually of the first released product) then be sure to use that ISBN in ALL of the products including the book you take it from. End users should be able to simply "select" using the Work Identifier and get all the books.
Let's pause for a moment and think just how useful <NoEdition /> is to end users: A marker for "All the formats I sell share the same content!!" Genius -- thank you EDItEUR! That means there's no extra implication here for Related Products beyond those listed above.
That takes us to the most typical metadata use for edition information which is using an "Edition Number" to mark a later edition. The general convention is that a sequential Edition Number is used when you published an updated book where 20% or more of the content is changed or new. It's a marker to show libraries and previous buyers that they should consider replacing their book copy, and for retailers so that they know that this is the book they should be offering for sale. Lesser changes than typical for an Edition Number but that still warrant a new ISBN can be marked using a "Edition Type Code" that describes the change. It really does NOT make sense to do both at the same time. An edition number "2" combined with "Revised" implies that there may be an edition number "2" prior to this "Revised" version so it's very much an either or choice (unless you really are revising the second edition and issuing it as a new ISBN – and then I have to wonder why it's not "3" if consistency is key).
What you're really doing while Edition information is telling end users that there are other options for CONTENT – not just format. That's really the meaning of Edition in metadata: Options are available for content and those books will have different ISBNs.
Clearly an Edition is a meaningful thing in a supply chain but retailers need to get information about many copies they sold previously and librarians need to confirm that their clients really did use the previous editions a lot. Related Product is how they track that old edition (listed in the new product as "Replaces) or know from their records that that there's a new edition of a high sales title (listed in the old product as "Replaced by"). It's a daisy chain! It's not only pretty but in enables records to be linked.
It that all you can do? Of course not. You should give a clear statement about what changes have been made to the new edition to explain why it's worth buying. That's usually part of the Main description that buyers and librarians will be using for their initial assessment. You might use Edition Statement for that as well but check the manual for recommendations on it's use. I if you've supplied Edition Number or Code you don't usually need Edition Statement as well. Consistency in your records is always recommended so in addition to adding the "Replaced by" ISBN to Related Product you should remove the <NoEdition /> tag from ALL the book records that carry it for that work (not just the same format – that there is new content is true for all the books even if there isn't a corresponding new format. Use the Work Identifier and it's easy). Note that replacing it with Edition Number "1" is optional and recommended only if adds clarity. For example, if the new edition is numbered "2" then making all the formats of the original edition "1" is clear, but if the new edition is "REV" then it's maybe less clear and up to you. The main thing is to remove the tag that says "no other edition exists" as it's now false and let the simple fact that it's an OP record listing another book as "Replaced by" identify it for the supply chain. If that other book is simply marked by a "REV" Edition Type Code everything is clear enough.
Ebooks, Editions and Version Number
Books are books, content is content and format is format. An ebook with the same content as a print book is just another format of that book. Why is that so unsatisfying and clearly not entirely true? It is true in terms of the metadata though digital books – like any other format – have unique coding. It feels wrong because digital products are often sold in a different supply chain, and because digital products have their own lingo and history – one part of which is product version numbers and file version control.
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Please note that there are no established guidelines within the digital product supply chain on file version number. This is an area you should expect change.
The conundrum of First Edition
You might note that I avoided the phrase First Edition and avoided writing out First, Second... as editions. There are two reasons for that: First, in metadata Edition Number should be given as a number -- 1, 2, 3, 4... and not as First, Second, Third, Fourth, or as 1st, 2nd, 3rd, 4th... Metadata always use integers (numbers) if the manual asks for them, and it usually will because databases can "action" numbers and use them to add, subtract and order sequentially. Words look nice and read well but they do not sequence without extra programming, Make life easy for your trading partners and always choose to make your file "machine readable" whenever possible.
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Don't leave mad though, here's a thought game you can play: Can a collectible First Edition have a meaningful Related Product entry in the sense described here for other editions? 500 word essays will neither be accepted nor read, but BookNet Canada will collectively be amused and appreciate the effort.
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Read more about Edition and Related Product on the BNC Blog at https://www.booknetcanada.ca/blog/2020/2/26/dont-do-what-donny-dont-does-editionrelated-product. Subscribe to the Blog's RSS at https://www.booknetcanada.ca/blog?format=rss.