[Evolution] Hooks to external program when adding/changing calendar/contacts

[Pascal DeMilly <list evolution newgenesys com>]

Is there any hooks I could use that will call an external program or a
plugin whenever I make a change to my Calendar. I would like to keep a
web base calendar in sync with Evolution which I use exclusively but for
that I need to be able to know when a change is made. If this feature is
not implemented, I think it could be useful to a lot of people trying to
keep their different program in sync. It could be as simple as calling
an external program with as argument a file name whose XML content would
be made of 2 tags <action> and <ICS>. Then it would be up to the
external program to do whatever is needed with it. 

Any comments?

Pascal