+DN.Connection <T DIA.Connection
+DN.Element <T DIA.Element : L0.Type
+
+DN.Vertex <T DN.Element
+ >-- DN.Vertex.HasElevation
+ @defProperty "Elevation" L0.Double
+ >-- DN.Vertex.HasAddress
+ @defProperty "Address" L0.String
+ >-- DN.Vertex.HasSupplyTemperature
+ @defProperty "Supply Temperature" L0.Double
+ >-- DN.Vertex.HasReturnTemperature
+ @defProperty "Return Temperature" L0.Double
+ >-- DN.Vertex.HasSupplyPressure
+ @defProperty "Supply Pressure" L0.Double
+ >-- DN.Vertex.HasReturnPressure
+ @defProperty "Return Pressure" L0.Double
+ >-- DN.Vertex.HasDeltaPressure
+ @defProperty "Delta pressure" L0.Double
+ >-- DN.Vertex.HasDeltaTemperature
+ @defProperty "Delta temperature" L0.Double
+ >-- DN.Vertex.HasHeatPower
+ @defProperty "Heat Power" L0.Double
+ >-- DN.Vertex.HasNominalHeadM
+ @defProperty "NominalHeadM" L0.Double
+ >-- DN.Vertex.HasNominalHeadB
+ @defProperty "NominalHeadB" L0.Double
+ >-- DN.Vertex.HasNominalFlow
+ @defProperty "Nominal Flow" L0.Double
+ >-- DN.Vertex.HasMaximumHeadM
+ @defProperty "Maximum head M" L0.Double
+ >-- DN.Vertex.HasHeatLoadDs
+ @defProperty "Heat Load ds" L0.Double
+ >-- DN.Vertex.HasMassFlow
+ @defProperty "Mass Flow" L0.Double
+ >-- DN.Vertex.HasVolFlow
+ @defProperty "Vol Flow" L0.Double
+ >-- DN.Vertex.HasVelocity
+ @defProperty "Velocity" L0.Double
+ >-- DN.Vertex.HasFlowArea
+ @defProperty "Flow Area" L0.Double
+ >-- DN.Vertex.HasValvePosition
+ @defProperty "Valve position" L0.Double
+ >-- DN.Vertex.HasNominalPressureLoss
+ @defProperty "Nominal Pressure Loss" L0.Double
+ @L0.assert DN.Vertex.HasElevation 0.0