WSDL

When viewing the endpoints in a web browser, you can click the link that appears as a parameter for svcutil.exe to see the Web Service Description Language (WSDL) file that completely describes the web service. The WSDL file is in XML format.

The WSDL documents for the legacy endpoint and the native endpoint are not the same. For the legacy endpoint, you will see that the target namespace in the WSDL file is:

https://schemas.microsoft.com/dynamics/gp/2006/01

For the native endpoint, you will see that the target namespace in the WSDL file is:

https://schemas.microsoft.com/dynamics/gp/2010/01

Typically, the WSDL file isn't used directly by the developer. It is designed to be read by development tools so they can learn about the definitions of the operations, objects, and enumerations provided by the service.