| Interface | Description | 
|---|---|
| EngineComparatorExtension<A> | For creating custom ComparisonOperator. | 
| Expression<T> | Interface for implementing Expressions, invoked on a  ExecutionEnvironment | 
| StringCoercionExtension | Interface to extend to implement custom coerce of  Strings to an instance of the given type, when when validatingPropositionTerms | 
| Class | Description | 
|---|---|
| BinaryOperatorExpression | Binary Operator implementation of Expression | 
| BooleanValidatingExpression | The  Expressionused in construction, will be invoked with the givenExecutionEnvironment. | 
| ComparisonOperatorServiceImpl | ComparisonOperatorServiceImplementation. | 
| ComparisonOperatorServiceUtils | Contains utility methods for working with the ComparisonOperatorService | 
| ConstantExpression<T> | The  Expressionused in Construction will be returned when invoked with any givenExecutionEnvironment | 
| DefaultComparisonOperator | The default  ComparisonOperator. | 
| ExpressionBasedProposition | |
| FunctionExpression | An implementation of  Expressionwhich invokes aFunctionwith the results of the invocation of the given
 List ofExpressions (of the givenExecutionEnvironment). | 
| TermExpression | An implementation of  Expressionwhich resolves the givenTerm. | 
| Enum | Description | 
|---|---|
| ComparisonOperator | Operators enumeration for comparing objects. | 
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