events vs callbacks (was Re: SAX2 (was Re: DOM vs. SAX??? Nah. ))

David Megginson david at
Thu Feb 25 14:57:32 GMT 1999

Gabe Beged-Dov writes:

 > SAX is described as an event-based API. IMO, it is a callback based
 > API. Iam guessing that many will find this either a debateable
 > distinction or one not worth dwelling on. I feel it is worth
 > distinguishing.  This is separate from the issue of whether it is
 > worthwhile to either replace the callback API with an event API, or
 > layer an event API on top of the callback API.

Event-based programming existed before people started encapsulating
events in structures or objects.  I'd define SAX as an event-based API 
that reports events using callbacks.

All the best,


David Megginson                 david at

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