[Tagging] bridge=movable?

[Dave F.]

Hi

What's the purpose of bridge=movable?

http://wiki.openstreetmap.org/wiki/Key:bridge:movable

It's good that the different types of bridge are tagged & the graphics 
are excellent, but I'm unsure why they need to be separated to a sub tag.

bridge=movable
bridge:movable=swing

gives bridge=swing

If there is a genuine reason, then surely there should be the equivalent:

bridge=static
bridge:static=*

Cheers
Dave F.


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