| Interface | Description | 
|---|---|
| Function | 
 Represents a function shown in the expression editor. 
 | 
| FunctionModel | 
 Methods to add and remove script functions in the Expression Editor accessible from Assignment and If program nodes among others. 
 | 
| Exception | Description | 
|---|---|
| FunctionException | 
 This exception is thrown if a function has an illegal name, illegal parameter or too many parameters. 
 | 
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