Features of class group can contain other features. A feature can be contained in any number of group features and each group feature can contain any number of features. The features assigned to a group feature are called members of that group feature. Groups features are a good way to structure contents but are also used in data processing and data presentation.

The feature type of the group feature defines what feature types are allowed as member features. The Application Server can list all members of a group feature. For each feature all group features it is a member of can be determined.

To add a feature as member to a group feature or to remove a feature from a        group feature the user must have Modify (1) on the group feature and Read (0) on the member feature.