| Symbol | Specification | Kind | Type |
|---|---|---|---|
| . .O | gownership | f | idxO → ref → id |
| . .id | gownership | f | idxO → id |
| . × . | gownership | f | id × (ref → id) → idxO |
| id | ownership | s | |
| id | gownership | v | id |
| idxO | gownership | s | |
| idxO | gownership | v | idxO |
| null | ref | c | ref |
| of | gownership | v | ref → id |
| ref | ref | s |