This figure shows an example of a parallel flow operation for the PartnerSupplierMediator and InternalWarehouseService web services. Within the BPEL process is a flow that contains two sequences, one for PartnerSupplierMediator and the other for InternalWarehouseService. In each sequence is an invoke activity to initiate the service and a receive activity to wait for the callback. Outside the BPEL process is the PartnerSupplierMediator web service and its accompanying WSDL, and the InternalWarehouseService web service and its accompanying WSDL.