I suspect what you will find is that API's are defined with records, one or more of whose fields is a map. You do kind of do that with Mnesia tables where you w

I suspect what you will find is that API's are defined with records, one or more of whose fields is a map. You do kind of do that with Mnesia tables where you want to specify the indexable-keys up front, but need to have the flexibility to extend the schema - a nice kv list does the trick.