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In order to describe a city model, CityGML utilizes thematic modules. The base module is the CityGML Core which gets extended by defined thematic modules such as Building, Bridge, Vegetation, Transportation, WaterBody, Relief, LandUse, Appearance etc. In this tutorial, the building module will be used to explain the CityGML concepts. Examples will be given in CityGML 2.0 as most existing tools are using this version. However, the examples will be given in CityGML 3.0 XML encoding as well to see the differences of CityGML 2.0 and CityGML 3.0.
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CityGML 3.0 Module Overview ([OGC document 20-066](https://docs.opengeospatial.org/guides/20-066.html))
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 CityGML ver. 2.0 Modules ([Overview](https://docs.opengeospatial.org/guides/20-066.html)) CityGML ver. 3.0 Modules ([Overview](https://docs.opengeospatial.org/guides/20-066.html))
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The following example shows a CityModel (CityGML 2.0) that makes use of several modules including Building, Bridge, WaterBody, Vegetation, Relief, and Transportation.
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