Many Meanings of Message Validation

fluent-validation.cs

public class OrderItem
{
    public string ItemId { get; set; }
    public int Amount { get; set; }
}

public class OrderItemValidator : AbstractValidator<OrderItem>
{
    public OrderItemValidator()
    {
        RuleFor(item => item.ItemId).Matches(@"\w+\-\w+\-\w+");
        RuleFor(item => item.Amount).GreaterThan(0).LessThanOrEqualTo(100);
    }
}

var orderItem = new OrderItem();
var validator = new OrderItemValidator();
var result = validator.Validate(orderItem);

openapi.yaml

...
paths:
  # Path definition
  /pets:
    get:
      description: Returns all pets from the system that the user has access to
      responses:
        '200':
          description: A list of pets.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/pet'
...
components:
  ...
  schemas:
    # Schema definition
    pet:
      type: object
      required:
      - name
      properties:
        name:
          type: string
        address:
          $ref: '#/components/schemas/Address'
        age:
          type: integer
          format: int32
          minimum: 0
...

order.json

{
  "orderId": 123,
  "items": [
    {
      "itemId": "pizza-hwaiian-large",
      "amount": 1
    },
    {
      "itemId": "water-sparkling-medium",
      "amount": 1
    }
  ]
}

wsdl.xml

<description>
  ...
  <types>
    // Definition of data contract
  </types>
  ...
  <interface>
    // Definition of service contract
  </interface>
  ...
  <service>
    // Definition of service endpoint
  </service>
  ...
</description>