L0 = <http://www.simantics.org/Layer0-1.1>
STR = <http://www.simantics.org/Structural-1.2>
SEL = <http://www.simantics.org/SelectionView-1.2>

DN = <http://www.simantics.org/DistrictNetwork-1.0>

TT = DN.TechType : L0.Library

table = TT.TechTypeTable <T L0.Entity
    // Table data as a CSV string literal
    >-- table.HasData <R L0.HasProperty : L0.TotalFunction
        --> L0.String
    
    // Link to corresponding component type
    >-- table.HasComponentType <R L0.IsRelatedTo : L0.FunctionalRelation
        --> STR.ComponentType

TT.Functions : L0.Library
TT.Functions.techTypeCodeValueAccessor : L0.ExternalValue
  L0.HasValueType "ValueAccessor"
TT.Functions.techTypeKeys : L0.Function
  L0.HasValueType "ReadGraph -> Resource -> a -> b"

TT.TechTypeCodeParameterType : SEL.GenericParameterType
    @L0.assert L0.valueAccessor TT.Functions.techTypeCodeValueAccessor