See: Description
| Interface | Description | 
|---|---|
| Mapper | To separate out the various map and search policies for class
 names and template names, we use classes that implement this
 interface. | 
| Class | Description | 
|---|---|
| BaseMapper | A base class for the various mappers which contains common
 code. | 
| BaseTemplateMapper | This is a mapper like the BaseMapper but it returns its
 results with the extension of the template names passed or (if no
 extension is passed), the default extension. | 
| ClassMapper | This mapper tries to map Template names to class names. | 
| DirectMapper | The most primitive mapper. | 
| DirectTemplateMapper | The most primitive templating mapper. | 
| LayoutTemplateMapper | This mapper is responsible for the lookup of templates for the Layout
 It tries to look in various packages for a match:
 1. about,directions,Driving.vm      <- exact match
 2. about,directions,Default.vm      <- package match, Default name
 3. about,Default.vm                 <- stepping up in the hierarchy
 4. | 
| ScreenDefaultTemplateMapper | This is a pretty simple mapper which returns template pathes for
 a supplied template name. | 
| ScreenTemplateMapper | This is a pretty simple mapper which returns template pathes for
 a supplied template name. | 
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