Please do some searching in the WebI forums – that’s where OpenDocument syntax is usually discussed.
However, I believe that it’s not an OpenDocument piece of syntax – but HTML syntax – that you are looking for. At least that’s the way it was in 5.x. Here is where I wrote up my understanding on non-SDK OpenDocument syntax for version 2.x, plus some extra HTML clauses, and at that time, I remember knowing that there were various HTML options for the TARGET= clause which you could pick – one of which would cause you to open in a new window.
Anita Craig 
(BOB member since 2002-06-17)