| Mandatory | Repeatable | Editable |
|---|---|---|
| no | may only occur once per ownership description | yes |
Indicates a geographic area associated with a specific ownership.
The evidence sequence indicator in $6 groups all chunks of information that describe the evidence for a specific ownership. All fields with an identical subfield $6 within a record describe the same ownership.
Subfield $a consists of 4 code positions:
| c/p0 | Start of time period - century |
| c/p1 | Start of time period - decade |
| c/p2 | End of time period - century |
| c/p3 | End of time period - decade |
The following codes are used:
| Century | Decade | ||
|---|---|---|---|
| s | 15th | 0 | 1st |
| t | 16th | 1 | 2nd |
| u | 17th | 2 | 3rd |
| v | 18th | 3 | 4th |
| w | 19th | 4 | 5th |
| x | 20th | 5 | 6th |
| y | 21st | 6 | 7th |
| - | unknown | 7 | 8th |
| 8 | 9th | ||
| 9 | 10th | ||
| - | unknown | ||