Additional attribute status in EnergyDemand

Created by: JoachimBenner

The featureType EnergyDemand can be used either to provide input data for energy demand simulations or to represent the output data of these simulations. At the moment, EnergyDemand has no property to indicate whether the property energyAmount carries input data or simulation results.

Proposal

1. Introduce a new (mandatory?) property status of EnergyDemand with property values defined by an enumeration
2. Introduce a new enumeration EnergyDamandStatusValue with items: Simulated, Measured, Estimated, Unknown (must be discussed)