| Class | Description | 
|---|---|
| RqlExpression | 
 This is the base class for RQL expressions - expressions that
 are part of a query but cannot themselves be a query (because they
 do not necessarily evaluate to a boolean value). 
 | 
| RqlStatement | 
 This represents a single RqlStatement, which contains a query,
 an order by clause, a range clause, and a property hints clause. 
 |