In a RESTful Application Programming object, where is the validation implementation code contained?

In a RESTful Application Programming object, validation implementation code is typically contained within a local class. Local classes are defined within the context of a particular program or method, which means they can encapsulate behavior that is specific to that context, including validation logic. This allows for modular design and easier maintenance, as the validation can be kept close to where it is used within the RESTful application.

Local classes offer encapsulation and enhanced readability since they are used exclusively within the specific object or function they are defined in. This scoping makes it easier to manage data validation relevant to the specific operations of that RESTful interface, ensuring that the validation logic is not mistakenly reused in other parts of the application.

In contrast, global classes, while they can be used to implement validation, are generally designed to be reusable across the entire application, which may not be suitable for context-specific validation logic. Functions and subroutines, while they can perform validation tasks, do not provide the same encapsulation and modularity benefits as a local class.