Add occupancy information

[danielvillalbamota]

Add some occupancy attributes for some systems that do not manage available spots but occupied ones.

• occupiedSpotNumber : Number of spots occupied.
• occupancyModified : Timestamp when the occupiedSpotNumber was updated. The format follows the ISO8601.
• percentageOccupancy : Percentage of occupied spots over the total.

[albertoabellagarcia]

As stated in the guidelines all the values which are relative it should be expressed in a value between 0 and 1.
The rest of the changes looks nice. Fix it to be accepted.

[danielvillalbamota]

Ok, is there a naming convention for this kind of relatives values? I have seen some attributes with the suffix "Level" (e.g. occupancyLevel), but I would like to find the proper one.

[albertoabellagarcia]

We have neither a recommendation nor an obligation regarding this. Maybe we should.
What it is true is that you can use a plain name (without a level suffix) for magnitudes which are relative.
so my recommendation would be if this is a real magnitude use the plain name. It is not necessary to identify that the magnitude is a percentage in the property name.

[danielvillalbamota]

Ok, then I will leave it simple. I am going to propose "occupancy" as the relative value of occupied spots out of the total spots.

[danielvillalbamota]

I want to include two more attribute related to the number of vehicle that enter and leave the parking (vehicleEntranceCount and vehicleExitCount), Should I do it in this PR or in a new one?

[albertoabellagarcia]

mostly right. There is a minor issue on the schema, I'll fix it.