The type of trademark as well as an indicator of what sort of trademark symbol should be displayed.
| Value | Meaning | Behavior |
|---|---|---|
| doi | Digital Object Identifier | |
| Restriction: |
||
| Value | Meaning | Behavior |
|---|---|---|
| copyright | A copyright | |
| registered | A registered trademark | |
| service | A service mark | |
| trade | A trademark | |
| Restriction: |
||