Editing IFC projects and contexts
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IFC data is structured in a hierarchy. This hierarchy must have a starting point. In IFC4, there are two special IFC classes which can contain the rest of the IFC data: | IFC data is structured in a hierarchy. This hierarchy must have a starting point. In IFC4, there are two special IFC classes which can contain the rest of the IFC data: | ||
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| This contains a list of unit definitions that are related to the project. Commonly, a project may define a series of metric units or imperial units, and specify what is the default unit for length, area, volume, weight, time, and currency measurements. It is also possible to define custom units. This is usually created automatically by the BIM authoring tool. | | This contains a list of unit definitions that are related to the project. Commonly, a project may define a series of metric units or imperial units, and specify what is the default unit for length, area, volume, weight, time, and currency measurements. It is also possible to define custom units. This is usually created automatically by the BIM authoring tool. | ||
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