Instead of or in addition to using the predefined validation suites and their rules, you can create your own model-based validation suites with custom validation rules.

Validation suites composition
Validation suites are created as part definitions that contain validation rules created as part usages. The validation suite is only comprised of validation rules.
Custom validation rule's composition
A custom validation rule is comprised of the following components:
- Name. The name of the failed validation rule.
- Severity. The failed validation rule's severity level.
- Message. The failed validation rule's message explaining the failure.
- Condition. The condition expression specifying the validation rule. If the condition expression evaluates to false for a certain element, the element fails the validation.
For specific procedures, see the (2026x Refresh1) Creating validation suites and rules page.
3DS SysML Customization library structure
The 3DS SysML Customization library contains the DassaultSystemesValidation namespace, dedicated to validation suites and rules customization:

- <DS_Validation>DassaultSystemesValidation
- CoreValidationComponents. Contains concepts for creating custom validation suites and validation rules.
- Suites. Contains predefined validation suite instances.