| Method | Arguments | Result | Notes |
|---|---|---|---|
| id | string | id | |
| str | id | string | |
| exists | string | boolean | |
| exists-id | id | boolean | |
| size | integer | ||
| names | list of strings | ||
| map | string id | id | |
| clear | |||
| serialize, --> | dictionary (string --> id) | ||
| deserialize, <-- | serial | ||
| load, := | serial | ||
| merge, += | serial | ||