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| Interface Summary | |
| ExpressionManager | Work interface for the component that creates Expression objects. |
| Class Summary | |
| DefaultExpressionManager | Implementation of the ExpressionManager role. |
| IsNullFunction | Returns true if argument is null. |
| NullFunction | Returns null constant. |
| StringFunction | Converts argument to the string. |
| SumFunction | Sum function. |
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