[Features] File system watcher event provider. [Application Area] 
Event Providers
E v e n t C l a s s
S u b s c r i p t i o n C l a s s
N o t i f i c a t i o n C l a s s
E v e n t P r o v i d e r s
C o n t e n t F o r m a t t e r s
D e l i v e r y P r o t o c o l s
S u b s c r i p t i o n M a n a g e m e n t A p p l i c a t i o n