[Tagging] one way part of the year

[doug brown]

I do not understand the notation that has been used in these replies.  for example, piste:type=nordic contains three elements, and tags have only two elements: key and value.   I would appreciate some carification on this notation.
Also, to further clarify my question, I am tagging the park trails, all of which are multiple use, as follows (key, value):(highway, path)(horse, yes)(bicycle, no)(snowmobile, designated)(ski, crosscountry)(sac_scale, hiking)(surface, dirt)(trail_visibility, excellent)(width, 1.5)
This tagging scheme was developed from the responses I received from previous questions to this forum.  Now I need to factor one trail that is oneway only for cross country skiing.  I don't understand how the piste fits is.

> From: tod at fitchdesign.com
> Date: Tue, 23 Jul 2013 06:38:31 -0700
> To: tagging at openstreetmap.org
> Subject: Re: [Tagging] one way part of the year
> 
> Your question was about a way used for nordic skiing in winter and that
> while being used for skiing it was one way but for the rest of the year
> was both way. So I assume that you'll be tagging it with piste:type=nordic,
> piste:grooming=*, piste:difficulty=*, etc. Seemed natural to me that
> piste:oneway=yes might fit. :)
> 
> -Tod
> 
> 
> 
> On Jul 23, 2013, at 6:22 AM, fly wrote:
> 
> > Am 23.07.2013 01:42, schrieb Tod Fitch:
> >> http://wiki.openstreetmap.org/wiki/Ski#Other_Features gives a piste:one
> >> way tag which seems like it should fit the bill.
> > 
> > oneway:ski=yes/-1 would fit, too but you seem to talk about the piste
> > feature.
> > 
> > fly
> > 
> > 
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