| Interface | Description | 
|---|---|
| ExpressionVisitor | Expressionmodel visitor | 
| Class | Description | 
|---|---|
| AbstractExpressionConfiguration | Abstract node for expressions whose result depends on the selected configuration | 
| BinaryExpression | Binary Expression. | 
| BooleanConstant | Boolean  trueorfalse | 
| CheckBoxSelected | CheckBoxOptionselection state | 
| ComboMatchingIndexes | ComboOptionselection state | 
| Constant | Root class of constant reification. | 
| DoubleConstant | 64bits IEE754 floating point constant | 
| EnabledNode | JPFExtensionTabNodeenable state | 
| Expression | Root class for option expression behavior. | 
| IntegerConstant | Integer constant (no limit) | 
| ScriptConfiguration | Selected script configuration property. | 
| StringConstant | Unicode characters string | 
| UnaryExpression | Unary Expression. | 
| VMConfiguration | Select VM configuration name | 
| Exception | Description | 
|---|---|
| ExpressionError | Exception thrown when an Expression cannot be computed to a constant. |