Sturct and aliases in UML

@startuml

skinparam shadowing false
skinparam class {
    BackgroundColor White
    BorderColor Black
    ArrowColor Black
}

' Template class Id
class "Id<Tag, Rep = std::uint32_t>" as Id <<template>> {
  + value() : Rep const
}

' Empty tag marker
class AxisIdTag <<struct>> {
}

' alias AxisId
class AxisId <<alias>>

' Template binding: AxisId = Id<AxisIdTag, std::uint8_t>
AxisId -down-> Id : <<bind>>\nTag -> AxisIdTag,\nRep -> uint8_t

' The tag is only used as a template parameter (optional, for clarity).
AxisIdTag -up- Id : <<bind>>

note right of AxisId
  using AxisId = Id<AxisIdTag, std::uint8_t>;
end note

@enduml