[vanderwal]

Well laid out. This is a much better approach than heirarchy as much of this is not heirarchy based.

If I need to make a "call" it most likely will not be location context based, but in a few occasions it may be.

Heirarchy would seem to get in the way, but having facets would be a better approach as facets do not require irrelevant order. A facet would be location. So, "Location: office, Location: home, Location: travel, etc.". If I select my location as office I will get all calls for "Location: office" as well as ones with out any location selected. Location is also based on devices one has within reach, like a laptop, notbook, presentation, file cabinet, etc. so the facets could have a device needed element, "Device: laptop, Device: policy binder, etc.".

The heirarchy approach works well for physical space but since this is a digital tool facets are a much more flexible approach as well as using just plain flat tags.