| Name | Type | Description | Notes |
|---|---|---|---|
| key | char * | key is the field selector key that the requirement applies to. | |
| _operator | char * | operator represents a key's relationship to a set of values. Valid operators are In, NotIn, Exists, DoesNotExist. The list of operators may grow in the future. | |
| values | list_t * | values is an array of string values. If the operator is In or NotIn, the values array must be non-empty. If the operator is Exists or DoesNotExist, the values array must be empty. | [optional] |