We are still working on this feature.
The idea is to bring certain behaviours to a topic based on its definition.For example, if the definition for a topic is "product", then it could have a place to add price. Or, if the definition is a "location", it could have latitude and longitude. The feature is not fully developed yet and it is not accessible, unless a customer wants to use the API to create a feed of all topics with the same definition.
Where to find and to change the Definition for a topic: