[Tagging] Removing name_1 and alt_name_1 from Wiki

Gerd Petermann GPetermann_muenchen at hotmail.com
Sun Jan 24 10:12:27 UTC 2016


I don't think so. Where do we need null values in OSM?

As you said, maxspeed=none means something like maxspeed=unlimited.

I can't think of any tag key which should be stored in OSM with a null value.

In what case would that add valud information compared to having no such tag ?


Gerd

________________________________
Von: Colin Smale <colin.smale at xs4all.nl>
Gesendet: Sonntag, 24. Januar 2016 10:58
An: Tag discussion, strategy and related tools; Tijmen Stam
Betreff: Re: [Tagging] Removing name_1 and alt_name_1 from Wiki

At present the string "none" is actually a value, the interpretation of which is specific to the key "maxspeed" . Maybe we should promote it to the equivalent of NULL in SQL.


On 24 January 2016 10:43:16 CET, Tijmen Stam <mailinglists at iivq.net> wrote:

With the value "none"

For example on German Autobahnen, where you can drive as fast as you
want is "maxspeed=none" which is different from having maxspeed not set:
this means maxspeed is unknown or not tagged yet.



On 20-01-16 09:06, Colin Smale wrote:
 Exactly.

 If a missing value (i.e. use the default) is not the same as explicitly
 having NO value, how do you override the default with "no value"?

 --colin

 On 2016-01-20 08:50, Gerd Petermann wrote:

 I don't think that the meaning really depends on the position. My
 understanding is that the

 complete value (e.g. "80||" ) is parsed by splitting it into separate

strings at each pipe symbol.

 Result: three strings: "80" , "",""

 The value "|80|" also gives three strings: "","80",""

 Another point is that an empty value means "use the default", which can

 only make sense in special cases  like this.

 Gerd


________________________________

 *Von:* Colin Smale <colin.smale at xs4all.nl>
 *Gesendet:* Mittwoch, 20. Januar 2016 08:23
 *An:* Tag discussion, strategy and related tools
 *Betreff:* Re: [Tagging] Removing name_1 and alt_name_1 from Wiki

 I meant that there is a value missing "between the pipes", which at a
 slightly higher semantic level can mean "use the default". A
 definition which varies according to position doesn't feel well-formed
 to me.

 //colin

 On 2016-01-20 08:10, Gerd Petermann wrote:

     Colin Smale wrote

         The "lanes" tag family uses a different delimiter ("|"), sometimes

        together with a semicolon to make a kind of 2-d array. A
         double pipe
         ("||") indicates a missing value there. Wouldn't it be nice if
         we were
         consistent?


     That is new to me. My understanding of a double pipe is that
     described here:
     http://wiki.openstreetmap.org/wiki/Proposed_features/lanes_General_Extension#Default_values
Proposed
 features/lanes General Extension - OpenStreetMap Wiki<http://wiki.openstreetmap.org/wiki/Proposed_features/lanes_General_Extension#Default_values>
wiki.openstreetmap.org
A
 simple, straightforward extension of existing tags to specify properties not only for a way as whole but for the lanes of the way instead. Based on this general ...



     Proposed features/lanes General Extension - OpenStreetMap Wiki
     <http://wiki.openstreetmap.org/wiki/Proposed_features/lanes_General_Extension#Default_values>
     wiki.openstreetmap.org<http://wiki.openstreetmap.org>
     A simple, straightforward extension of existing tags to specify

properties not only for a way as whole but for the lanes of the
     way instead. Based on this general ...


     which indicates that a double pipe means one or two default values,
     depending on the position.
     At the end of the value, it means two default values.

     Gerd



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