By default, Adapter for SAP will use the standardized BizTalk XML envelope format for these XML messages. This simplifies data exchange with other Web messaging systems. The BizTalk XML envelope differentiates between an application-specific XML body and an XML header, which is used to exchange transport-specific information, for example for routing purposes. The BizTalk XML envelope can be used with both BAPI and RFC XML calls and also for both synchronous and asynchronous processing. See Using BizTalk Envelopes with Adapter for SAP for more information.