ONIX Code Lists Issue 22, July 2013
List 43: Text item identifier type code

Value Description Notes

01 Proprietary For example, a publisher’s own identifier.
03 GTIN-13 Formerly known as the EAN-13 (unhyphenated).
06 DOI
09 PII Publisher item identifier.
10 SICI For serial items only.
15 ISBN-13 (Unhyphenated).