The CustomRoleBlockProcessor is currently used for all the outputs whereas it should only be used for the DocBook output.

Asciidoctor already takes care of everything for the HTML output and it does it cleanly whereas our approach generates invalid HTML.

Moreover it seems that this processor wasn't very compatible with adding other processors: https://github.com/beanvalidation/beanvalidation-spec/pull/152#discussion_r109894349 .