Class

The class of a type describes whether the type represents a simple data object (item), a complex data object (group), or whether is used to organize types (category). Define the class of the selected type by selecting the check box.

Category
Categories organize types that have common properties. Each category has a set of item properties and a set of group properties. Subtypes of the category inherit these properties.

A category does not define data objects in detail. A category type may be a component of a partitioned group, after a component with the identifier attribute. A category cannot be a component of a non-partitioned group.

Item
The item type represents a simple data object that does not consist of any objects. An item does not have components.
Group
The group type represents a complex data object that consists of components.

To change a type's class, select the type and choose the desired class in the Properties window.

If you change a type to an item, all the types in its subtree become items. If you change a type to a group, all the types in its subtree become groups. This is because the schema has a classification hierarchy and all the nested subtypes of an item must be items. Similarly, all the nested subtypes of a group must be groups.


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