How many classes does WSDL2Apex generate per WSDL document?

When working with WSDL2Apex in Salesforce, it is important to understand how this tool processes WSDL documents to create Apex classes for web service consumption. WSDL2Apex generates two classes for each WSDL document: one is the main class that contains the operations defined in the WSDL, and the other is a supporting class that manages the data types used in those operations.

The main class typically has methods that correspond to the web service operations, allowing developers to invoke those operations directly within their Apex code. The supporting class, often referred to as a complex type or data type class, handles the structures needed for the input and output of the web service calls. This separation facilitates easier management of data types and enhances code readability and maintainability.

In summary, the generation of two classes aligns well with how web services are designed to operate, where a distinction exists between the operations and the data structures involved. Thus, two classes are generated per WSDL document by WSDL2Apex, making it possible for developers to interact effectively with the web service.