1.8 Vendor-Extensible Fields

As specified in section 2, the Active Directory Federation Service (AD FS) Web Agent Protocol uses SOAP messages for communication, as specified in [SOAP1.1] and [SOAP1.2-1/2007]. The core functionality of SOAP is to provide extensibility. [SOAP1.2-1/2007] and [SOAP1.1] contain detailed discussion on the SOAP messaging framework extensibility model. Vendors can use these SOAP extensibility points as specified.