I understad the explanation from @Jörg_Hoh but I have some doubs, the
same servlet with the same resourcetype, and selectors but with
extension JSON I need to use /jcr:content.selector.json but! with for
example extension XML is not necessary with XML I can do
content/myproject/en/article1.selector.xml without use jcr:content. How
it's works ? Have sense this special behaviour only for extension JSON ?