| Class | Description | 
|---|---|
| Expression | 
 Purpose: Define an object-level representation of a database query where clause. 
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| ExpressionBuilder | 
 Purpose: Allow for instances of expression to be created. 
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| ExpressionMath | 
 Purpose: This class mirrors the java.lang.Math class to allow mathimetical function support within expressions. 
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| ExpressionOperator | 
 Purpose: ADVANCED: The expression operator is used internally to define SQL operations and functions. 
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| ListExpressionOperator | 
 INTERNAL: A ListExpressionOperator is used with an ArgumentListFunctionExpression. 
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