For example to enter zone 'K' door 1 must be
opened on the A side, zone 'A' must be entered
and then door 15 on the 'A' side must be opened.
Additionally doors 1a and 15a must be opened to
get in, 15b and 1b to get out.
Of course another path can be taken; open door
20 on the 'A' side, enter zone 'B', open door 21 on
the 'B' side, enter zone 'A', open door 7 on the 'A'
side, enter zone 'I', open door 9 on the 'A' side and
finally enter zone 'K' but that would be taking a
very inefficient route.
Doors on the outside of a building and the zones
connected to these doors are entered as 'root
nodes' in the tree structure in Inepro Back Office.
Zones that are accessible exclusively by another
zone have that zone as a parent in the tree
structure.
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