Standard attributes are attributes that the Knowledge Provider itself understands and processes in certain situations. These properties represent built-in functionality of the runtime layer and therefore cannot be changed or removed. All you can do with these attributes is assign values to them.

To ensure that standard attributes can be read by entities via the runtime layer function, you have to set the Class Att flag.

Free attributes are user-defined attributes in which extra information pertaining to the application can be stored.

Instance attributes, as the name suggests, are attributes of instances of an info object class. Therefore, instance attributes do not have any values in the development layer. They can, however, have multiple properties, such as dynamic, obligatory, and unique.

Only real info object classes are instantiated in the runtime layer.

Replicated instance attributes are highlighted in color. These can be changed to a limited extent only. The properties Required and Unique can be more strictly defined here than for the superordinate info object class. If you select the display option More for an attribute (by clicking on the yellow arrow in the column More), the view Other Attribute Assignment Properties opens. You have the option of changing the additional attributes that are hidden in the column More. If an attribute was transferred from the LOIO, no other properties for this attribute can be changed.