| Interface | Description | 
|---|---|
| ExpandableParameterResolver | 
 Allows to resolve an expandable parameter. 
 | 
| ExpandableToken | 
 A token, which may or may not expandable. 
 | 
| Class | Description | 
|---|---|
| EventTemplate | 
 The  
EventTemplate represents the event input, containing place-holders, e.g. | 
| ExpandableConstant | 
 The simplest  
ExpandableToken is a "not" expandable token, or ExpandableConstant. | 
| ExpandableParameter | 
 An  
ExpandableParameter requires the #ExpandableParameter#parameter to be replaced with an appropriate value. | 
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