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The idea behind Zones is, if a particular deployment is not capable of servicing a particular request, the request may be forwarded to (child) Zones for possible processing. Zones may be nested in a tree fashion.
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Zones only know about their immediate children, they do not know about their parent Zones and may in fact have more than one parent. Likewise, a Zone's children may themselves have child Zones.
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Zones only know about their immediate children, they do not know about their parent Zones and may in fact have more than one parent. Likewise, a Zone's children may themselves have child Zones and, in those cases, the grandchild's internal structure would not be known to the grand-parent.
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Zones share nothing. They communicate via the public OpenStack API only. No database, queue, user or project definition is shared between Zones.