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# Anforderungen und Prüfungen für die Validierung von CityGML-Modellen

The requirements are the basic building blocks for a validation plan to validate CityGML models. For naming conventions and definitions, see fundamentals.

A requirement can be validated by one or more checks. A check validates one or more requirements on a model. Each check can have preconditions. If these preconditions are not met, the check is not executed. A distinction is made between:

- Schema Requirements
- Geometry Requirements
- Semantic Requirements