The Microsoft Project file is considered to represent one process so one WS-BPEL file is created to represent it.
A project always has one start event with a None trigger so it will always start with en empty activity. (No start condition can be specified in the MS Project file)
A project always has one end event with a None result so it will always end with an empty activity. (No result can be specify in the MS Project File)
Current conversion to WS-BPEL supports only the basic mapping as described in section 14.1 of BPMN 2.0 specification available at http://www.omg.org/spec/BPMN/2.0/Beta2.
Every event and task having no WS-BPEL mapping is transformed into a WS-BPEL Empty activity.