Chapter 3 Using Business Rules in a CDM
The different business rule types that you can define in a CDM are described below:
| Rule type | Describes | Example |
|---|---|---|
| Definition | Properties of the element in the information system | A customer is a person identified by a name and an address |
| Fact | Certainty, existence in the information system | A client may place one or more orders |
| Formula | Calculation used in the information system | The total order is the sum of all the order line costs |
| Requirement | Functional specification in the information system | The model is designed so that total losses do not exceed 10% of total sales |
| Validation | Constraint on a value in the information system | The sum of all orders for a client must not be greater than that client's allowance |
| Constraint | Additional check constraint on a value. Constraint business rules are used in the PDM, they are generated in the database | The start date should be inferior to the end date of a project |
For more information on constraint type, see section Using constraint business rules in a PDM in chapter Using Business Rules in a PDM in the Physical Data Model User's Guide .
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