m.Resources = in.Resources
	seen := sets.New[string]()
	// Process resources.
	for i, r := range m.Resources {
		if r.Validate == "" {
			validateFn := "Validate" + asResourceVariableName(r.Kind)
			if !validation.IsValidateFunc(validateFn) {
				validateFn = "validation.EmptyValidate"
			} else {
				if r.Kind == "EnvoyFilter" {
					validateFn = "envoyfilter." + validateFn
				} else {
					validateFn = "validation." + validateFn
				}

	return Validation{Err: e}
}

// ValidateFunc defines a validation func for an API proto.
type ValidateFunc func(config config.Config) (Warning, error)

// IsValidateFunc indicates whether there is a validation function with the given name.
func IsValidateFunc(name string) bool {
	return GetValidateFunc(name) != nil
}

// GetValidateFunc returns the validation function with the given name, or null if it does not exist.