[Tagging] key covered=* applied to storage tanks

[António Madeira]

Greetings.

There are closed and open storage tanks, and I think is important to 
differentiate them, specially those used by firefighters and rural 
communities to fight wild fires.
The approved proposal for the key covered=* states "C. denote an area 
such as an underground parking lot, a covered reservoir/cistern or even 
such things as an aquarium (e.g., Kelly Tarlton's, Auckland, NZ), when 
the covering is not a man-made structure that would allow layer 
differentiation."

I would like to know what the community thinks about elaborate that line 
a bit more, to include emergency storage tanks so that people know it's 
ok to add covered=* to those structures.

Regards,
António.