On 27/07/18 21:11, Martin Koppenhoefer wrote:

sent from a phone

On 26. Jul 2018, at 21:26, François Lacombe <fl.infosrese...@gmail.com> wrote:

I don't want to break things but only improve them, all the best

one issue with using only one unit for a tag is that they can’t always be 
transformed without rounding. E.g. maxspeed=55mph cannot be converted to kph 
without losing information

Also, shorter notations are better readable, hence reduce the likeliness of 
errors not noted.

On the other hand, I agree in the example of voltage it would make it easier 
for queries to use the same unit. (you still can make queries, but they are 
more complicated if you have to take units into account)



Unfortunately not everyone uses the same units... heights are in meters, feet 
.. depending on where you come from or what activity you follow.

Voltages are in volts so the same units... but multiplies are common for high 
voltages .. no one uses 33000 volts .. they all use 33 kv.
If you stipulate that all voltages have to be in kv then 115 v becomes 0.115 
kv, 240 v becomes 0.24 kv and 415 v becomes 0.415 kv ..
that is not how people talk about these things.



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