Wow, I did't expect that much responses. Thanks for all the ideas and suggestions!
Now, I can write a special server side component generating the correct json format. But I don't want to do this over and over again. And doing some transformation on the fly is also possible and doing the transformation client side can also be done, but needs to be hooked into the correct place. And I would repeat myself as well :) So my idea was to have this out of the box as this seems to be a common use case - maybe it's not :) In the meantime my urgent use case disappeared :) So as it seems that this use case is not that very common and can be solved in different ways, I think we should leave the json renderer as is. :) Thanks Carsten -- Carsten Ziegeler cziege...@apache.org