com.liferay.portlet.workflow.service
Interfaces 
WorkflowComponentService
WorkflowDefinitionService
WorkflowInstanceService
WorkflowTaskService
Classes 
WorkflowComponentServiceFactory
WorkflowComponentServiceUtil
WorkflowDefinitionServiceFactory
WorkflowDefinitionServiceUtil
WorkflowInstanceServiceFactory
WorkflowInstanceServiceUtil
WorkflowTaskServiceFactory
WorkflowTaskServiceUtil