| DelegatingLoader | DelegatingLoader delegates loading to other loaders using a loader resolver. |
| FileLoader | FileLoader is the abstract class used by all built-in loaders that are file based. |
| Loader | Loader is the abstract class used by all built-in loaders. |
| LoaderResolver | LoaderResolver selects a loader for a given resource. |
Interfaces
| LoaderInterface | LoaderInterface is the interface implemented by all loader classes. |
| LoaderResolverInterface | LoaderResolverInterface selects a loader for a given resource. |