The image shows the relationships among the BPEL components, including:

• BPEL Engine: Business Process and TaskActionHandlerProcess (Manages task life cycle)

• Worklist application: Web application to search for tasks, view tasks, act on tasks

• Workflow Services

  • Identity Service Provides: User/group/role lookup, user authentication, authorization

  • Task Manager and Task Routing Service: Provides task persistence, task escalation/reassignment based on user info, APIs to retrieve tasks based on specified criteria, role resolution, send notifications.

  • Worklist Service: Retrieve tasks based on specified filter, sort tasks, retrieve task attachments, and perform action on selected tasks

  • Notification Service: Sends notification to users by e-mail, voice message, or short message service

• User Directories, which can be Oracle Internet Directory, JAZN/XML, or LDAP, Custom