| Name | Type | Description | Notes |
|---|---|---|---|
| id | String | Required. An id assigned to this node by the parser which is unique in a given expression tree. This is used to associate type information and other attributes to the node. | [optional] |
| fieldKey | String | The field key for a message creator statement. | [optional] |
| mapKey | Expr | [optional] | |
| value | Expr | [optional] | |
| optionalEntry | Boolean | Whether the key-value pair is optional. | [optional] |