| Function | nearest_context_with_adapter | Find the nearest adapter in the url chain between obj and interface. |
| Function | nearest_adapter | Find the nearest adapter in the url chain between obj and interface. |
| Function | nearest_provides_or_adapted | Find the nearest object that provides or can be adapted to interface. |
The function looks upward though the canonical url chain and returns a tuple of (object, adapter).
| Returns | if there is no object that has such an adapter in the url chain. | |