openhab2 addon.cfg and transformation

In the addon.cfg it is now necessary also to specify the transformation services.
What is the exact syntax for the transformation service.

I want to use json, map and XSLT
transformation = map,XSLT,jsonpath

With XSLT do I have to create a xslt.cfg or a http.cfg to specify the transformation files?

Also, map should be default. I cannot imagine someone not using map.
Maybe all transformation services should be default, there are not so many and the user has one source of configuration mess less.



Another idea could be to scan the items file to check what transformation features are used and so have to be installed ?

even better