You can view the reference model hierarchy and check the hierarchy level of different objects. You can also add user-defined attributes to the reference model objects. The added attributes can be used for filtering, for example. Additionally, you can view the native reference object attributes and properties.
Below is an example of a reference model representing a sanitary system. When you want to scroll the hierarchy, the Select assemblies selection switch or the Select objects in assemblies selection switch must be on. The 0 level IfcProject in the example is the upmost level.
Below you can see one of the reference objects on the 3 level, IfcBuildingStorey, of the same reference model.
The last level, level 4, shows the individual parts.
In the example below, one of the reference objects on the lowest level has been inquired.