Before building your category hierarchy, determine which category cardinality you want
to use: one per item or many per item. You choose the cardinality in the Category catalog
object. The Category catalog object plays a key role in category assignment and tracking
statistics.
| Cardinality Option |
Is a category present in an item action event? |
Actions |
| One per Item |
Yes |
- The category is set as the item’s category, replacing existing
categories. If the event contains more than one category, the first
category in the list is used.
- Statistics are tracked for the new category.
|
| No |
- No category change occurs.
- Statistics are tracked for the existing categories.
|
| Many per Item (default) |
Yes |
- The category is added to the item’s set of categories.
- Statistics are tracked only for the added category.
|
| No |
- No category change occurs.
- Statistics aren’t tracked for the existing categories, unless the item
contains only one category. For example, in a purchase interaction, if an
item has multiple categories, no category revenue attribution occurs
because categories can’t be included on purchase line items.
|
