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.