IHistogramDefinitionSvc Node1 IHistogramDefinitionSvc + DeclareInterfaceID() + ~IHistogramDefinitionSvc() + definition() + histoType() + title() + nBinsX() + nBinsY() + nBinsZ() + xLimits() + yLimits() + zLimits() + xTitle() + yTitle() + zTitle() Node2 IInterface Node2->Node1