On 20/02/19 10:32, Paul Allen wrote:
On Tue, 19 Feb 2019 at 23:16, Warin <[email protected] <mailto:[email protected]>> wrote:

    On 19/02/19 22:03, Paul Allen wrote:
    On Tue, 19 Feb 2019 at 03:48, Warin <[email protected]
    <mailto:[email protected]>> wrote:

        Nothing I could see on the wiki for this. So some guidance
        would be good.

        Units.


    I added a maxstay a few weeks ago and I found info about units at
    https://wiki.openstreetmap.org/wiki/Key:maxstay

    Units are not explicitly defined, but there are several
    examples.  Units in those examples
    are minutes, hours, and days.  I expect that weeks, months and
    years would also be
    acceptable for long-stay parking.  Maybe even decades and
    centuries, should they be
    needed.  Seconds are too small to be practicable.

    No information on default units.


True.  But the examples show which units are permissible and how they should be
specified.

    There are some numerical values in the data base without units ...
    from those values I would guess hours, but they could be days.


Or minutes, depending on actual value.  One place near me says waiting is limited to 90 minutes.
But 90 days is close to 3 months.  Could be either if units aren't given.

    As there is no documentation 'we' could make a decision.

    No information on abbreviations.


From the examples, unit names are spelled out in full.

So the choice is between:

  1) Spelling units in full (as per the examples) and specifying which unit is the default.

  2) Coming up with abbreviations and specifying which unit is the default.

I'd go with 1).  Firstly, somebody (like me) may have specified units that way already. Secondly, different languages may have different names for those units of time.  We can agree to (mostly) use SI units for mass and length because those are applicable in much of the world and have standard abbreviations.  Common time units like minute, hour and month probably have different abbreviations in different parts of the world.  Less error prone if an editor drop-down has minutes/hours/days than m/h/d if "d" is the abbreviation for a period of 3600 seconds in some language.  Thirdly, minutes and months (m and m).

Looks good to me. See what others think.

On default units ..
Possibly specify the smallest unit as that will cause the least amount of harm with already entered values? By that I mean a value of '60' if taken as days would be more harmful to the user (fines, tow away) than if taken as minutes.
Not convinced on this, but it is a thought.

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