| Tag | Field Name | XML Name | Data Type | Union Datatype | Description | Added | Depr. | Enums from tag | Valid values |
|---|---|---|---|---|---|---|---|---|---|
| 8 | BeginString | (not used in FIXML) | String |
Identifies beginning of new message and protocol version. ALWAYS FIRST FIELD IN MESSAGE. (Always unencrypted) | FIX.2.7 |
|