[clean-list] What does the L mean in the expression: :CloudsVertVisibility = L [CloudsVV] | SkyClear

[Erik Zuurbier]

Correct
----- Original Message ----- 
From: "metaperl" <metaperl at gmail.com>
To: <clean-list at science.ru.nl>
Sent: Monday, August 25, 2008 9:25 PM
Subject: [clean-list] What does the L mean in the expression: 
:CloudsVertVisibility = L [CloudsVV] | SkyClear


>
> I dont understand what the "L" means below. I'm guessing it is a type
> constructor for CludsVertVisibility which takes one argument... Just like
> "SkyClear" is a nullary type constructor.
>
> // clouds and vertical visibility
>
> :: CloudsVertVisibility = L [CloudsVV] | SkyClear
>
> :: CloudsVV = {amount :: CloudAmount,visibility :: Int}
>
> :: CloudAmount = Few | Scattered | Broken | Overcast
> -- 
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