Zend gdata calendar-looking for event created and event edited elements

I'm having a touch time finding the data from the Zend Gdata feed that gives me:

• The date that the event was created
• The date of the most recent edit to the event

I'm hoping to find these variables in a form similar t开发者_StackOverflow中文版o how I get the event ID:

pr($event->id->text);

I'm sure it is documents, and if anyone can point me to a chart of all the elements available in the feed, that would be great! Thanks!

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Ah-got it:

  pr($event->published->text);  //when event was first published
  pr($event->updated->text);    //when event was last updated.

http://code.google.com/apis/gdata/docs/2.0/elements.html