[Tagging] Still RFC — Drop stop positions and platforms

["Christian Müller"]

I'd go with function.  If sth. is tagged public_transport=platform
then within the scope of public transport this sth. /functions/ as a
platform.

It does not make sense to view this as a structure or "structure only"
tag, since it is not very specific about the physical realization.
I.e. material, shape, usage, condition vary greatly, while the function
of all realizations is a common denominator of all.

Sticking to this makes it easy to use it in combination with tags that
predominantly seek to describe physical properties (e.g. surface or
similar) and its also easier to understand that this function may be
shared with other functions (e.g. sidewalk).

Imho there is no concrete (read specific) realization associated with
the terms platform or sidewalk.  There is an expectation that sth.
physical exists that may be used to stand, walk or wait on, but in
general there is no surface (concrete, grass, carpet, paving
stones, etc.) or dimension attributes commonly associated when
the terms are used.

Let's lend a picture from another subject: Talking about fruits, ..
once the term is an abstraction for some instances (apples, bananas,
etc.), then someone announcing to give away a fruit won't let the
receiver(s) associate to a specific one (with confidence) until it
is seen, smelt, felt or tasted.

Same with a platform - unless a photo, description or survey reveals
key physical features, there is quite some room for speculation wrt
physical instances.


Greetings
cmuelle8

> Gesendet: Samstag, 31. März 2018 um 09:23 Uhr
> Von: "Selfish Seahorse" <selfishseahorse at gmail.com>
> An: "Tag discussion, strategy and related tools" <tagging at openstreetmap.org>
> Betreff: Re: [Tagging] Still RFC — Drop stop positions and platforms
>
> Is public_transport=platform now about the structure or the function?
> 
> If it is about the function, then we need a separate tag for the
> platform structure.
> 
> If it is about the structure, then we should decide to either map the
> sidewalk or public_transport=platform (depending on how we define a
> platform). Otherwise, we say that there are two physical structures,
> which is wrong.