# ONIX for Books 3.1

Source: https://xmlvalid.com/schemas/onix-3.1

> Book metadata feeds from publishers to retailers, libraries and aggregators, in ONIX 3.1 with reference tag names.

ONIX for Books is the metadata standard of the book trade: titles, contributors, prices, territories and availability. Retailers such as Amazon, Apple Books and national distributors ingest it.
The schema includes the ONIX code lists, so codes are checked as well as structure.

- Type: XSD
- Version: 3.1 revision 3, code lists issue 75
- Namespace: `http://ns.editeur.org/onix/3.1/reference`
- Root element: `ONIXMessage`
- Publisher: EDItEUR (EDItEUR terms of use (free of charge, unmodified)), source: https://www.editeur.org/93/Release-3.0-Downloads/
- Validate against it: https://xmlvalid.com/validate?schema=onix-3.1

## Notes

- Retailers add their own requirements on top of the schema. The schemas are kept exactly as EDItEUR publishes them, as its terms require.
- The example is the sample file that ships with the schema.