| Class | Description | 
|---|---|
| Mapping | 
 Execute a mapping: a re-usuable transformation 
 | 
| MappingData | |
| MappingIODefinition | 
 Helps to define the input or output specifications for the Mapping step. 
 | 
| MappingMeta | 
 Meta-data for the Mapping step: contains name of the (sub-)transformation to execute 
 | 
| MappingParameters | 
 We need out mapping to be parameterized. 
This we do with the use of environment variables. That way we can set one variable to another, etc.  | 
| MappingValueRename |