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Some metadata elements are to be compiled using the lists of controlled values taken from ONIX codelists.
Here you can have a look at the ONIX codelists required when compiling metadata according to the ONIX DOI Metadata Schema; the complete set of ONIX specifications is downloadable from the EDItEUR website.

• List 07: Product form code
• List 11: E-publication format code
• List 13: Series identifier type code
• List 17: Contributor role code
• List 21: Edition type code
• List 22: Language Role code
• List 24: Extent unit code
• List 26: Main subject scheme identifier code
• List 27: Subject scheme identifier code
• List 28: Audience code
• List 33: Other Text type code
• List 64: Publishing Status
• List 74: Language code - ISO 639-2/B
• List 91: Country code - ISO 3166-1