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HTTP/1.1 200 OK Date: Thu, 09 Oct 2025 04:01:37 GMT Server: Apache/2.4.28 (Unix) Phusion_Passenger/5.1.0 LibreSSL/2.2.7 Strict-Transport-Security: max-age=15768000 Content-Security-Policy: default-src 'none'; script-src 'self'; style-src 'self'; img-src 'self'; base-uri 'self'; form-action 'self' X-Content-Type-Options: nosniff Last-Modified: Sun, 07 Sep 2025 15:11:31 GMT ETag: "77b0-63e377c5f2ec0-gzip" Accept-Ranges: bytes Vary: Accept-Encoding Content-Encoding: gzip Content-Length: 4546 Content-Type: text/html ONIX codelists Issue 36

ONIX codelists Issue 36

The latest version of the ONIX codelists is: Issue 70.

Browse the ONIX codelists, or search for a specific term within the vocabularies.

List	Code	Heading	Add	Mod	?
51		Product relation code Used with • <ProductRelationCode> <x455> • <RelationCode> <h208> formerly Relation code			✽
51	00	Unspecified <Product> is related to <RelatedProduct> in a way that cannot be specified by another code value	1	11	✽
51	01	Includes <Product> includes <RelatedProduct>	1	11	✽
51	02	Is part of <Product> is part of <RelatedProduct>: use for ‘also available as part of’	1	11	✽
51	03	Replaces <Product> replaces, or is new edition of, <RelatedProduct>		11	✽
51	05	Replaced by <Product> is replaced by, or has new edition, <RelatedProduct> (reciprocal of code 03)		11	✽
51	06	Alternative format <Product> is available in an alternative format as <RelatedProduct> – indicates an alternative format of the same content which is or may be available		11	✽
51	07	Has ancillary product <Product> has an ancillary or supplementary product <RelatedProduct>	1	11	✽
51	08	Is ancillary to <Product> is ancillary or supplementary to <RelatedProduct>	1	11	✽
51	09	Is remaindered as <Product> is remaindered as <RelatedProduct>, when a remainder merchant assigns its own identifier to the product	1	11	✽
51	10	Is remainder of <Product> was originally sold as <RelatedProduct>, indicating the publisher’s original identifier for a title which is offered as a remainder under a different identifier (reciprocal of code 09)	1	11	✽
51	11	Is other-language version of <Product> is an other-language version of <RelatedProduct>	6	11	✽
51	12	Publisher’s suggested alternative <Product> has a publisher’s suggested alternative <RelatedProduct>, which does not, however, carry the same content (cf 05 and 06)		11	✽
51	13	Epublication based on (print product) <Product> is an epublication based on printed product <RelatedProduct>		11	✽
51	14	Epublication is distributed as <Product> is an epublication ‘rendered’ as <RelatedProduct>: use in ONIX 2.1 only when the <Product> record describes a package of electronic content which is available in multiple ‘renderings’ (coded 000 in <EpubTypeCode>): NOT USED in ONIX 3.0		11	✽
51	15	Epublication is a rendering of <Product> is a ‘rendering’ of an epublication <RelatedProduct>: use in ONIX 2.1 only when the <Product> record describes a specific rendering of an epublication content package, to identify the package: NOT USED in ONIX 3.0		11	✽
51	16	POD replacement for <Product> is a POD replacement for <RelatedProduct>. <RelatedProduct> is an out-of-print product replaced by a print-on-demand version under a new ISBN	5	11	✽
51	17	Replaced by POD <Product> is replaced by POD <RelatedProduct>. <RelatedProduct> is a print-on-demand replacement, under a new ISBN, for an out-of-print <Product> (reciprocal of code 16)	5	11	✽
51	18	Is special edition of <Product> is a special edition of <RelatedProduct>. Used for a special edition (German: Sonderausgabe) with different cover, binding, premium content etc – more than ‘alternative format’ – which may be available in limited quantity and for a limited time	8	11	✽
51	19	Has special edition <Product> has a special edition <RelatedProduct> (reciprocal of code 18)	8	11	✽
51	20	Is prebound edition of <Product> is a prebound edition of <RelatedProduct> (in the US, a prebound edition is ‘a book that was previously bound and has been rebound with a library quality hardcover binding. In almost all commercial cases, the book in question began as a paperback.’)	9	11	✽
51	21	Is original of prebound edition <Product> is the regular edition of which <RelatedProduct> is a prebound edition	9	11	✽
51	22	Product by same author <Product> and <RelatedProduct> have a common author	9	11	✽
51	23	Similar product <RelatedProduct> is another product that is suggested as similar to <Product> (‘if you liked <Product>, you may also like <RelatedProduct>’, or vice versa)	9	11	✽
51	24	Is facsimile of <Product> is a facsimile edition of <RelatedProduct>	9	11	✽
51	25	Is original of facsimile <Product> is the original edition from which a facsimile edition <RelatedProduct> is taken (reciprocal of code 25)	9	11	✽
51	26	Is license for <Product> is a license for a digital <RelatedProduct>, traded or supplied separately	9	11	✽
51	27	Electronic version available as <RelatedProduct> is an electronic version of print <Product> (reciprocal of code 13)	9	11	✽
51	28	Enhanced version available as <RelatedProduct> is an ‘enhanced’ version of <Product>, with additional content. Typically used to link an enhanced e-book to its original ‘unenhanced’ equivalent, but not specifically limited to linking e-books – for example, may be used to link illustrated and non-illustrated print books. <Product> and <RelatedProduct> should share the same <ProductForm>	13		✽
51	29	Basic version available as <RelatedProduct> is a basic version of <Product> (reciprocal of code 28). <Product> and <RelatedProduct> should share the same <ProductForm>	13		✽
51	30	Product in same collection <RelatedProduct> and <Product> are part of the same collection (eg two products in same series or set)	13		✽
51	31	Has alternative in a different market sector <RelatedProduct> is an alternative product in another sector (of the same geographical market). Indicates an alternative that carries the same content, but available to a different set of customers, as one or both products are retailer-, channel- or market sector-specific	22		✽
51	32	Has equivalent intended for a different market <RelatedProduct> is an equivalent product, often intended for another (geographical) market. Indicates an alternative that carries essentially the same content, though slightly adapted for local circumstances (as opposed to a translation – use code 11)	24		✽
51	33	Has alternative intended for different market <RelatedProduct> is an alternative product, often intended for another (geographical) market. Indicates the content of the alternative is identical in all respects	24		✽
51	34	Cites <Product> cites <RelatedProduct>	24		✽
51	35	Is cited by <Product> is the object of a citation in <RelatedProduct>	24		✽
51	36	Sales expectation Use to give the ISBN of another book that had sales (both in terms of copy numbers and customer profile) comparable to that the publisher or distributor estimates for the product. Use in ONIX 2.1 ONLY	31		✽
51	37	Is signed version of <Product> is a signed copy of <RelatedProduct>. Use where signed copies are given a distinct product identifier and can be ordered separately, but are otherwise identical	33		✽
51	38	Has signed version <Product> is an unsigned copy of <RelatedProduct>. Use where signed copies are given a distinct product identifier and can be ordered separately, but are otherwise identical	33		✽
51	39	Has related student material <Product> is intended for teacher use, and the related product is for student use	35		✽
51	40	Has related teacher material <Product> is intended for student use, and the related product is for teacher use	35		✽
51	41	Some content shared with <Product> includes some content shared with <RelatedProduct>. Note the shared content does not form the whole of either product. Compare with the includes / is part of relationship pair, where the shared content forms the whole of one of the products, and with the alternative format relationship, where the shared content forms the whole of both products	35		✽
51	42	Is later edition of first edition <Product> is a later edition of <RelatedProduct>, where the related product is the first edition	36		✽

version detail.

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