Modeling
- Modeling Guide for 3D Objects - Part 1: Basics (Rules for Validating GML Geometries in CityGML) ( Version 0.7.1 EN, English)

- Modeling Guide for 3D Objects - Part 2: Modeling of Buildings (LoD1, LoD2, LoD3) ( Version 2.0.1 EN, English)

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