From Tracker Software PDF SDK
The event is fired just before performing the save operation of the document. The IEvent interface should be cast to the IPXV_DocSaveEvent interface.
|Handled||VARIANT_BOOL||Specifies whether the event was handled. Marking the event as handled will cause the event sender to look at the event`s result and act accordingly based on the event type.|
|Result||PARAM_T||Specifies the result that will be used by the event sender when the event is marked as Handled. If the Result is E_NOTIMPL then native save will be used, else the save process must be handled by developer.|