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diff --git a/docs/diagrams/units-class-diagram.plantuml.txt b/docs/diagrams/units-class-diagram.plantuml.txt
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+++ b/docs/diagrams/units-class-diagram.plantuml.txt
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+@startuml
+abstract class Unit {
+        -unitBase : ObjectProduct<BaseUnit>
+        -nameSymbol : NameSymbol
+        -dimension : ObjectProduct<BaseDimension>
+        +{static} fromConversionFunctions(ObjectProduct<BaseUnit>, DoubleUnaryOperator, DoubleUnaryOperator) : Unit
+        #Unit(ObjectProduct<BaseUnit>, NameSymbol) : Unit
+        ~Unit(NameSymbol) : Unit
+        +canConvertTo(Unit) : boolean
+        +convertTo(Unit, double) : double
+        #convertFromBase(double) : double
+        #convertToBase(double) : double
+        +isMetric() : boolean
+        +withName(NameSymbol) : Unit
+}
+class BaseUnit {
+        -dimension : BaseDimension
+        -BaseUnit(BaseDimension, String, String, Set<String) : BaseUnit
+        +asLinearUnit() : LinearUnit
+}
+class LinearUnit {
+        -conversionFactor : double
+        +{static} valueOf(ObjectProduct<BaseUnit>, double) : LinearUnit
+        -LinearUnit(ObjectProduct<BaseUnit>, double, NameSymbol) : LinearUnit
+        +convertTo(LinearUnit, UncertainDouble) : UncertainDouble
+        +plus(LinearUnit) : LinearUnit
+        +minus(LinearUnit) : LinearUnit
+        +times(LinearUnit) : LinearUnit
+        +dividedBy(LinearUnit) : LinearUnit
+        +times(double) : LinearUnit
+        +dividedBy(double) : LinearUnit
+        +toExponent(int) : LinearUnit
+        +withPrefix(UnitPrefix) : LinearUnit
+        +withName(NameSymbol) : LinearUnit
+}
+class UnitPrefix {
+        -multiplier : double
+        +times(double) : UnitPrefix
+        +dividedBy(double) : UnitPrefix
+}
+class UnitDatabase {
+        -prefixlessUnits : Map<String, Unit>
+        -units : Map<String, Unit>
+        -prefixes : Map<String, UnitPrefix>
+        -dimensions : Map<String, ObjectProduct<BaseDimension>>
+        -unitExpressionParser : ExpressionParser<LinearUnit>
+        +loadUnitsFile(Path)
+        -addUnitOrPrefixFromLine(String, long)
+        +addUnit(String, Unit)
+        +containsUnitName(String) : boolean
+        +evaluateUnitExpression(String) : LinearUnitValue
+        +getUnit(String) : Unit
+}
+class UnitValue {
+        -unit : Unit
+        -value : double
+        +canConvertTo(Unit) : boolean
+        +convertTo(Unit) : UnitValue
+        +convertToLinear(LinearUnit) : LinearUnitValue
+}
+
+Unit <|-- BaseUnit
+Unit --* BaseUnit
+BaseDimension -o BaseUnit
+Unit <|-- LinearUnit
+Unit *- SI
+UnitValue --o Unit
+UnitDatabase --* Unit
+UnitDatabase --* UnitPrefix
+UnitDatabase --* BaseDimension
+UnitDatabase -* "4" ExpressionParser
+@enduml