Catalog: If no entry is made, the classification applies to all catalogs. The application of the classification can be restricted to a specific catalog via a selection list.

Class types [Types of classes]:

The selection under Class types [Types of classes] determines which options are available on the Classification dialog page in the list box under Filter.

Filter: Classes - Attachment points [Connection points]

Instance types [Types of instances]: Classes / Attachment points [Connection points] / Classes and attachment points [Classes and connection points]

The selection under Instance types [Types of instances] determines whether the Instance column on the Classification dialog page is editable or greyed out.

Instance editable

Example: In the plant manufacturing the use of instances would possibly make sense for pipe connections.