| Condition | Represents a condition that is part of a SQL where clause. | 
| ConditionList | This condition subclass represents a list of conditions. | 
| ConditionParser | A class to parse a condition string and return a condition. | 
| DataUtils | Utility methods for RMProperty. | 
| Entity | This class represents an entity for a data source. | 
| Property | This class describes an attribute of an entity. | 
| Query | An object to fetch a dataset from a data source entity with a set condition and parameters. | 
| Schema | This class describes the structure of a data source by managing a list of entities. | 
| Sort | This class provides a basic description for comparison and sorting with a simple key and order (ascending or
 descending). |