A Service Task is a Task that uses some sort of service, which could be a Web service or an automated application. A Service Task object shares the same shape as the Task, which is a rectangle that has rounded corners. However, there is a graphical marker in the upper left corner of the shape that indicates that the Task is a Service Task
: BpmnServiceTask (architecture_autodiagram)
Figure 12 : BpmnServiceTask (architecture_autodiagram)
string Implementation [1..1]
This attribute specifies the technology that will be used to send and receive the Messages. Valid values are "##unspecified" for leaving the implementation technology open, "##WebService" for the Web service technology or a URI identifying any other technology or coordination protocol. A Web service is the default technology.
OperationRef : BpmnOperation [0..1]