Design notes from a discussion held on Nov 23 2008
For "Advanced Find", we add the type propagation group "Records,From,To,Start From"
For "Exists" the type propagation group is "ALL_TRIGGER,Yes"
For "Branch' , the type propagation group is "Data|Selector,ALL_EXITS"
Although in theory there could be more than one type propagation group in a plugin descriptor, we currenlty only need a single group in each plugin descriptor
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