| Value | Meaning |
|---|---|
| LV2_OPTIONS_INSTANCE | This option applies to the instance itself. The subject must be ignored. |
| LV2_OPTIONS_RESOURCE | This option applies to some named resource. The subject is a URI mapped to an integer (a LV2_URID, like the key) |
| LV2_OPTIONS_BLANK | This option applies to some blank node. The subject is a blank node identifier, which is valid only within the current local scope. |
| LV2_OPTIONS_PORT | This option applies to a port on the instance. The subject is the port's index. |