This is one of the most useful feature of Tapestry 5.3. There is already a concept of
Zone in Tapestry for Ajax but now it is complimented by
AjaxResponseRenderer. This fills a lot of gaps at least for people coming from Wicket. It is a bit similar to
AjaxRequestTarget but empowered with Zones and JSON. I have compiled a small example demonstrating most of the features.