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Entity Validation API overview
In Drupal 8 Entity validation is moved to a separate Entity validation API and decoupled from form validation.
Defining Constrains (Validations) on Entities and/or Fields.
Constrains ensure data validity, integrity, and enforce business rules. They validate user imput and display error messagues.
Supported validation constrains [TBD]
List supported validation constrains and their settings.Also, document type-specific default constrains added in automatically here.
