Example of last possibilities : A multiple line chart side by side with a pie chart and a multiple column chart
Minot changes on pie chart generation by ST
Changes in the way to handle Concerns :
Some may need a parameter, so are real instances, as Spatial for example.
Others are static instance.
All are accessible by a factory

Update in smart campus API
How Concerns : one class per concern + hierarchy
What Concerns added + How simplified (name useless)