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The Catalog Management system has two primary APIs: the DTO-based API and the object-based API, where the object-based API relies on the underlying Data Transfer Object (DTO) API.

## DTO object model

The DTO API is the core catalog API and primarily used directly in the catalog administration and indirectly through the Object API.


## Runtime object model

The runtime object model is primarily used during runtime. Entry is the main object that you will most likely work with.