Ok … I have got a basic understanding of the DSL Rules and got HABApp working (thanks to Sebastian) … I am going to focus on JSR Python following Rich’s post Journey to JSR223 Python 1 of 9
At this point, staying within OpenHab will probably allow me to learn more before I take a plunge into HABApp.
So far I have found that its hard to follow the documentation since there are so many platforms to support and evolving concepts … one needs to work carefully and have low expectations 
for quick progress.