isql.expression
Interfaces 
ISimpleExpression
IWhereExpression
Classes 
AggregateFunction
CaseExpression
CaseExpressionTest
ColumnExpressionByGroup
ColumnExpressionSimple
ConstantExpression
DoubleExpression
DoubleExpressionTest
UnaryExpression
When
WhenThen
Enums 
AggregateType