Thanks James, that's pretty much what I've been proposing.
> I think it should like this:
>
> Civic: USA->Florida->Miami->BuildingA->Floor4
> Relative: (ref=) Elevator->offset
>
> where the reference <element> is identified, and everything in the
> relative part is separately indicated to ensure there is no confusion.
>
> This both reduces the data to its minimum set, and for
> interoperability - only what's understood will be used, with the
> possibility that the recipient doesn't understand this extension,
> meaning they don't understand the whole "Relative" part, leaving that
> entity to believe the target is on <Floor>4</Floor>. We just have to
> have firm text saying the target must be within x distance of floor
> 4. An easy example of somewhere outside floor 4 that still needs to
> be valid is a parking lot outside the building, or a window cleaner
> hanging outside the windows of floor 4.
>
> James
>
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