We should definetely think about the generic rule presentation in the docs too, while organizing the jsr223 refactoring.
This is something we have to improve.
We should not say xtend is bad or jsr is better, but we should have a rules area that explains the possibilities and then afterwards shows more information about the different ways of doing rules.
I am also thinking of extracting the rules articles out of the configuration section and moving it into its own docs section.
Rules is such a big topic and you cant explain it with one side per rule techinque.