IBIS as typically used has three basic elements "issue", "position", "argument" and a limited set of ways that the nodes may be connected. Issues (questions) can be associated with any node. Positions (answers) can be associated only with issues. Arguments can be associated with positions but not with questions. wikipeda 
Issue: specializes Issue: generalizes Issue: replaces Issue:
Issue: raises Argument: which supports Position: objects Position: which responds Issue:
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