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For ONIX 2.1, EDIt EUR originally maintained copies of the latest versions of the DTDs and XSD schemas on the website for online lookup as part of the validation of an ONIX message.

As part of the planned 'sunset' of ONIX 2.1 at the end of 2014, this online option has now been removed.

Three schema definition options are available for ONIX 3.0.

The recommended options are the ISO standard Relax NG (RNG) schema language or the W3C (XSD) schema language, which allow the most effective validity checking. All three options support both reference names and short tags for ONIX data elements. All three packages include the latest issue of the codelists, but with a DTD these can be used only to control attribute values, not coded data elements.

The complete documentation package below includes the is updated regularly to incorporate new and improved guidance, usually alongside new issues of the Codelists.

Any comments on the guidelines should be forwarded to [email protected]– views are particularly invited from non-English language implementers, and on how well the best practices described meet the needs of different national book and e-book supply chains.

For example, the advanced schema is able to validate ISBN check digits.

EDIt EUR strongly recommends validation of ONIX messages using the XSD or RNG schemas (the DTD can be used for validation, but XSD and RNG are preferred.

The specification also includes an annotated sample file, and the file can be downloaded separately here.

A specification for the new ONIX Acknowledgement message is also available.

The DTD intended primarily for use with various XML tools such as the tagname converver below).

For more detail, please see the XML technical notes which are part of the Release 3.0 documentation packages above.

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