# Using Delta Publish

Since delta messages must be processed and merged into the existing SOW record, AMPS provides a distinct command for delta publish.

| Command         | Result                                                                                                                                                                                           |
| --------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| `delta_publish` | <p>Publish a delta message.</p><p>If no record exists in the SOW, add the message to the SOW.</p><p>If a record exists in the SOW, merge the data from this record into the existing record.</p> |
