[Description] Estimated importance of a role to completion of the main tasks of a delivery unit. For example a main menu is typically required for a user to beale to completer the main tasks of a site. A secondary side menu is typically less important. Hence a main menu has an importance level of one and secondary side menu may have an importance level of 0.6. [Values] 0 (min) 1 (max) [Property] 
importance
s u p p o r t e d S t a t e
m u s t C o n t a i n
s c o p e
m e d i a
i m p o r t a n c e
n a m e R e f