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The features list on the OmniOutliner product page does prominently mention that OmniOutliner is scriptable with AppleScript, and there's a question on the General FAQ on the product page talking about accessing attachments with AppleScript, so it isn't a very well-kept secret.

I'm not sure that any part of the OmniOutliner manual qualifies as an in-depth treatment.

Geez, next you're going to be complaining that there isn't any discussion of the Automator actions, either :-)