Link attributes versus relationship attributes
You can use links and relationships between catalogs and items.
The following table describes the different performance characteristics for both links and relationship attributes.
|Links attributes||Relationship attributes|
|Link attributes are used in item objects only.||Relationship attributes can be used in both item and category objects.|
|Link attributes are associated through the primary key of the target item.||Relationship attributes are associated through the internal id of the target item.|
|Link attributes can be associated to an item that does not exist yet.||Relationship attributes cannot be associated to an item that does not exist yet in target catalog.|
|Link attributes targets a catalog that is identified at design time (in catalog attributes).||Relationship attributes targets a catalog that is chosen at run time.|
|Link attributes are limited to the primary spec,||Relationship attributes can be used in primary and secondary specs.|