Contains the participants list of a work item (work item owners). Only these owners may execute an action on item. A user who does not appear in the participants list, receives an error when executing an action.
The URLs are follows:
From the Workflow Generic Task Processing service:
http://<host name>:<port>/sap/opu/sdata/sap/wfgentaskprocessing/WorkflowTaskCollection(value='<workitem_id>',scheme_id='IW_WF_GEN_TASK',scheme_agency_id='<SID>_<client>')/ParticipantsCollection?$format=xml
From the Workflow User Decision Task Processing service:
http://<host name>:<port>/sap/opu/sdata/sap/wfdecisiontaskprocessing/WorkflowTaskCollection(value='<workitem_id>',scheme_id='IWF_USER_DECISION_TASK_GW',,scheme_agency_id='<SID>_<client>')/ParticipantsCollection?$format=xml
From the Workflow Dialog Activity Task Processing service:
http://<host name>:<port>/sap/opu/sdata/sap/wfactivitytaskprocessing/WorkflowTaskCollection(value='<workitem_id>',scheme_id='IWF_ACTIVITY_TASK_GW',scheme_agency_id='<SID>_<client>')/ParticipantsCollection?$format=xml
You can find the details of each participant in the User Details complex type nested in this collection.