Options for representing the query node types.
| And | And node. |
| Or | Or node. |
| Filter | Filter node. |
| Search | Word search node. |
| Not | Negation node. |
| NestedQuery | Nested query node. |
| Where | Where enumerator node. |
| FilterIn | Filter with nested query node. |
| Union | Union node. |
| Intersection | Intersection node. |
| Aggregator | Aggregator node. |
| Comment | Comment node. |
| Toggle | Toggle node. |
| Group | Group node. |