| Attribute | Required | Values | Default Value | Explanation |
|---|---|---|---|---|
| column | Yes | The ID of a field in the “foreign” form | n/a | The ID of the field whose value we will use to constrain the set of instances of the “foreign” form in the relationship. |
| One of {smaller, smallerEqual, equal, notEqual, greaterEqual, greater} | Yes | The value to use in this condition | false | The value against which every value in the specified column should be compared, using the specified comparision operator. |