| Interface | Description | 
|---|---|
| DataTransformer | Data transformation capabilities used by data input and data output transformation
 as part of BPMN2 process definition. | 
| EventListener | An interface that represents an element that is listening
 for specific types of events. | 
| NodeInstance | A node instance represents the execution of one specific node
 in a process instance. | 
| NodeInstanceContainer | A node instance container is a container that can contain
 (zero or more) node instances. | 
| ProcessContext | Represents the context when executing a process. | 
| ProcessInstance | A process instance represents one specific instance of a process
 that is currently executing. | 
| ProcessRuntime | The  ProcessRuntimeis a super-interface for allStatefulKnowledgeSessions. | 
| StatefulProcessSession | There are currently no process related methods that are used with the external StatefulKnowledgeSession class. | 
| StatelessProcessSession | There are currently no process related methods that are used with the external StatelessKnowledgeSession class. | 
| WorkflowProcessInstance | A workflow process instance represents one specific instance of a
 workflow process that is currently executing. | 
| WorkItem | Represents one unit of work that needs to be executed. | 
| WorkItemHandler | A work item handler is responsible for executing work items
 of a specific type. | 
| WorkItemManager | A work item manager is responsible for finding the right
 work item handler when a work item should be executed and
 should be notified when this work item has been completed
 (or aborted). | 
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