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@drewfore I'm not using it myself but my colleagues use CityGML extensively, e.g. researchgate.net/publication/279847360_Coupling_of_CityGML-based_semantic_city_Models_with_energy_simulation_tools_some_experiences & isprs-ann-photogramm-remote-sens-spatial-inf-sci.net/III-4/139/2016/isprs-annals-III-4-139-2016.pdf