[Tagging] Move tag to a subtag (landuse=port)

[Malcolm Herring]

On 18/08/2015 15:45, Stefano wrote:
> What's your opinion?
>

It is important to distinguish between a port and a harbour, dock or 
terminal. These are often confused, and I see this confusion in 
reference [0]. A port is an administrative entity, whereas 
harbours/docks/terminals are physical entities. A port may contain any 
number of harbours/docks/terminals (>=0) as well as other buildings or 
areas of land not contained with the boundaries the 
harbours/docks/terminals.

Any tagging scheme for these entities should take into account these 
important differences.