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ONIX ISTC Registration Format

In association with the International ISTC Agency, EDItEUR has developed an ONIX ISTC registration format to be used by ISTC registrants and ISTC Registration Agencies, in accordance with guidelines issued by the International ISTC Agency. The format supports two-way communication and covers all stages of the ISTC registration process, as well as subsequent corrections or amendments. (For more information about ISTC, see

After extensive piloting with a draft version of the format, Version 1.0 was published in 2009. A minor update of the documentation and XML schema was completed in October 2011. The latest version 1.0.1 schema is fully compatible with the original version 1.0 from 2009, and primarily serves to update various codelists in line with similar updates in ONIX for Books.

You can read or download the format specification and the current codelists here, and download a copy of the schema in W3C Schema language (.xsd) for local use:

The schema is available for online use at the URL below, and this URL should be used in XML declarations within ONIX for ISTC messages:

Use of the original v1.0 schema is now deprecated, and organizations using the XML message specification to register or update ISTCs should migrate to using the v1.0.1 schema above for validation purposes. However the original v1.0 schema remains available:

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