Data type for VacancyRate.. property values

[arch1501]

The properties VacancyRateInCategoryNow and VacancyRateInCategoryFuture are defined by the data type IfcPositiveRatioMeasure. The values are given in percentage 0% <= value <= 100%. It is importante also to set a value to 0%. This is with the data type IfcPositiveRatioMeasure not allowed.

Solution: New data type IfcNonNegativeRatioMeasure

Another solution would be to use IfcRatioMeasure, but to allow negative percentage values are in this case not the best solution.