A product data catalogue can include all valid products, including all applicable articles ("full") or only modified products and articles ("delta"). A delta load provides complete data per included product (including all possible variants), but only articles that have changed since the last time stamp. Not modified products are not included in a delta load and don't need to be processed further.

An inventory data catalog contains either the stock of all products valid at the time of retrieval and included in the last product catalog ("full") or only the inventory changes since the last polling time ("delta").