CityGML

CityGML 3.0 Conceptual Model – UML Class Diagram (Enterprise Architect file)

CityGML 3.0 Conceptual Model – UML Class Diagram (XMI files)

CityGML 1.0 and 2.0 XML schemas

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CityGML datasets (and 3D city models in further representations and data formats):

Awesome CityGML – List of international Open Data 3D city models

Cities/regions around the world with open datasets

Example datasets for the CityGML 3.0 GML Encoding for education, software development, and testing purposes.

Note, that these files can still change until the official release of the CityGML 3.0 GML Encoding specification (they have been stable now since 2020, though)

Open Data Initiatives

Open-Source CityGML 3D Semantical Building Models in 2020

Test datasets in all Levels-of-Detail

OGC managed list of implementations for CityGML

CityGML Wiki with lists of commercial software, freeware, and Open Source software and tools

OGC Community Standard CityJSON 1.0, a JSON-based encoding for CityGML 2.0

CityGML Modeling Guide

Provided by the SIG 3D of the German National Spatial Data Infrastructure GDI-DE) with recommendations on object structuring, geometry validation procedures, and data acquisition rules