Options:

1. Add a check to see if there are any duplicate subjects. If so, rollback all 
insertions done to that point and throw an exception.
2. Just ignore the second and later subjects with the same URI and keep going.
3. DELETE what was inserted of that particular event and return 0 for it (but 
insert all other events).

-- 
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Framework Team, which is subscribed to Zeitgeist Framework.
https://bugs.launchpad.net/bugs/909708

Title:
  Inserting event with two subjects with the same URI breaks the
  following event

Status in Zeitgeist Framework:
  Confirmed

Bug description:
  By the way our database is structured, all subjects of a same event
  must have different URIs.

  However, this isn't currently being checked, with the effect that the
  first subject is inserted correctly, while the second subject triggers
  the "existing event" exception and rolls back the event ID. This has
  the effect that the next event to be inserted will incorrectly have
  the same event ID (thus its subjects are mixed into whatever got saved
  of the first event and all sorts of weirdness :P).

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