| 01 | Early notification | Use for a complete record issued earlier than approximately six months before publication | 0 | |
| 02 | Advance notification (confirmed) | Use for a complete record issued to confirm advance information approximately six months before publication; or for a complete record issued after that date and before information has been confirmed from the book-in-hand | 0 | |
| 03 | Notification confirmed on publication | Use for a complete record issued to confirm advance information at or just before actual publication date, usually from the book-in-hand, or for a complete record issued at any later date | 0 | 11 |
| 04 | Update (partial) | In ONIX 3.0 or later only, use when sending a ‘block update’ record. A block update implies using the supplied block(s) to update the existing record for the product, replacing only the blocks included in the block update, and leaving other blocks unchanged – for example, replacing old information from Blocks 4 and 6 with the newly-received data while retaining information from Blocks 1–3, 5 and 7–8 untouched. In previous ONIX releases, and for ONIX 3.0 or later using other notification types, updating is by replacing the complete record with the newly-received data | 0 | 42 |
| 05 | Delete | Use when sending an instruction to delete a record which was previously issued. Note that a Delete instruction should NOT be used when a product is cancelled, put out of print, or otherwise withdrawn from sale: this should be handled as a change of Publishing status, leaving the receiver to decide whether to retain or delete the record. A Delete instruction is used ONLY when there is a particular reason to withdraw a record completely, eg because it was issued in error | 0 | 13 |
| 08 | Notice of sale | Notice of sale of a product, from one publisher to another: sent by the publisher disposing of the product | 2 | |
| 09 | Notice of acquisition | Notice of acquisition of a product, by one publisher from another: sent by the acquiring publisher | 2 | |
| 88 | Test update (Partial) | Only for use in ONIX 3.0 or later. Record may be processed for test purposes, but data should be discarded when testing is complete. Sender must ensure the <RecordReference> matches a previously-sent Test record | 26 | |
| 89 | Test record | Record may be processed for test purposes, but data should be discarded when testing is complete. Sender must ensure the <RecordReference> does not match any previously-sent live product record | 26 | |