The PIXPDQ_HL7V3_Direct_ca project defines the service assembly for the all of the HL7 v3 BPEL projects. In the graphic below, you can see that messages are processed in through the HTTP Binding Component using either SOAP 1.1 or 1.2. Each BPEL process generates a response, which is then processed back out through the same Binding Component. ATNA logging activities are handled through the HTTP Binding Component (using SOAP) for all three BPEL modules.