Conceptual objects can be defined to adhere to cardinality rules, which specify the minimum and maximum number of child records each parent record in an object must have. For example, a cardinality rule can enforce a relationship that every country record must have at least one state child record, but not more than six. For more information about cardinality, see Implementing webMethods OneData. While adding or editing records in a conceptual object, the cardinality must be considered.