I'd like to add few properties to better describe / characterize the Energy schema. But I'm not completely sure which would be the best approach. The current schema is not providing any way to specify for instance basic information like:

• the Primary Energy Source, that might be further divided/classified in:
  • Non-renewable
    - Fossil fuels
    - Oil
    - Coal
    - Natural gas
    • Mineral fuels
      • Natural uranium
      • Natural thorium
  • Renewable
    • Solar energy
    • Wind energy
    • Water
      • Failing
      • Flowing
      • Tidal
    • Biomass
    • Geothermal
• the Energy system component/technology, that might be further divded/classified in:
  • Photovoltaic power plant
  • Fossil fuel power plant
  • Nuclear power plant
  • ...
• the Energy carriers
  • Fuel oil
  • Electricity
  • Mechanical work
  • Heat
  • Gas
  • Hydrogen
• the Energy type (perhaps is not the right wording):
  • Production (the energy produced by a plant)
  • Demand (the energy required by a system e.g. a residential house to satisfy their needs)
  • Consumption (the energy that has been used)
  • Primary energy (before any transformation to a secondary form of energy)
  • Final energy (that include the losses for the energy transmission)
• Type of source of data (again the wording should be revised/discussed...):
  • measured
  • simulated
  • assessed
  • modeled

So I was thinking to add few properties into the Energy schema to cover these kind of information.
Furthermore, I would like to characterize not only a single numerical value but a whole dataset and it is not clear to which could the best approach, do you think that it could be a good Idea to extend the Dataset schema and create an EnergyDataset?

So for instance if I have the following data sets:

• a dataset with the estimation of solar photovoltaic potential on the building roof in Europe I should be able to extend the Dataset schema to further describe:
  • Primary energy source: Renewable > Solar energy
  • Energy carrier: Electricity
  • Energy component / technology: photovoltaic power plant
  • Energy type: Production
  • Type of source of data: Assessed
• a dataset with the estimation of the thermal energy demand of the buildings in Europe I could have:
  • Primary energy source: Renewable > Multiple
  • Energy carrier: Heat
  • Energy component / technology: Multiple
  • Energy type: Demand
  • Type of source of data: Modeled
• a dataset with the monitored consumption for a residential building:
  • Primary energy source: Renewable > Multiple
  • Energy carrier: Heat
  • Energy component / technology:
    • Boiler
    • Shallow geothermal energy plant
  • Energy type: Consumption
  • Type of source of data: Measured

Based on your experience what would be the best approach to cover these kind of information?
Should we consider to create a set of enumeration to cover the main options?

For some property probably we should think to build dedicated world like for the Energy component / technology, where we could specify also the installed capacity, and some dedicated information, for example a wind farm might specify the number of turbines the height of the wind mill, the diameter of the system, the area occupied, etc.

Moreover, often a single dataste include the informtion of several "kind" of energy so the option would be to split the dataset in homogeneous data sets with the same kind, or to find a way to better specify inside the data set which are the variable available.

Where should I start to introduce/discuss these kind of concepts?