namespace System.Web.Mvc {
    using System.Collections.Generic;

    // The purpose of this interface is to make something as supporting client-side
    // validation, which could be discovered at runtime by whatever validation
    // framework you're using. Because this interface is designed to be independent
    // of underlying implementation details, where you apply this interface will
    // depend on your specific validation framework.
    //
    // For DataAnnotations, you'll apply this interface to your validation attribute
    // (the class which derives from ValidationAttribute). When you've implemented
    // this interface, it will alleviate the need of writing a validator and registering
    // it with the DataAnnotationsModelValidatorProvider.
    public interface IClientValidatable {
        IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context);
    }
}