| IElementHandler<TData,TElement extends IWorkflowElementEntity> | 
 All element handlers must be thread-safe. 
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| IElementHelpLocation | 
 Models the location of the help page for a workflow element. 
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| IElementPropertiesBean<TData,TElement extends IWorkflowElementEntity> | 
 The interface of a bean for editing the properties of workflow elements. 
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| IElementPrototypeData<TData> | 
 The data that is used to create a new workflow element when an element prototype is dragged into the workflow
 designer. 
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| IElementPrototypeDescriptor<TData> | 
 A prototype for a workflow element (node or trigger) that is shown in the drawer panel in the workflow designer. 
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| IElementWithTask<TElement> | 
Represents a workflow element together with the  WorkflowTask to which it belongs.  
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