<uml> cloud «ETH» {

folder "Pascal (N.Wirth)" {
  component "Pascal" as Pascal
}

folder "Modula-2 (N.Wirth)" {
  component "Modula-2" as Modula2
}

folder "Oberon (N.Wirth)" {
  component "Oberon" as Oberon
}

folder "Oberon SA (N.Wirth)" {
  component "Oberon SA" as OberonSA
}

folder "Object Oberon ()" {
  component "Object Oberon" as ObjectOberon
}

folder "Oberon-2 (N.Wirth,H.Mossenbok)" {
  component "Oberon-2" as Oberon2
}

folder "Active Oberon ()" {
  component "AOS" as AOS
  component "JaOS" as JAOS
  component "BlueBottle" as BlueBottle
  component "Active Oberon" as ActiveOberon
  AOS -down-> JAOS
  AOS -down-> BlueBottle
  BlueBottle -down-> ActiveOberon
}

}

cloud «Microsoft» {

folder "Zonnon (J.Gutknecht)" {
  component "Zonnon" as Zonnon
}

}

folder «Oberon/L ()» {

component "Oberon/L" as OberonL

}

folder «Component Pascal ()» {

component ComponentPascal as CP

}

cloud «1985, Kronos Research Group» {

frame "Excelsior OS" as ExcelsiorOS

}

cloud «1999, Excelsior Inc.» {

node "XDS" as XDS

}

cloud «1993, Oberon Microsystems Inc.» {

node "BlackBox Component Builder" as BlackBox

}

Pascal -down→ Modula2 Modula2 -down→ Oberon Oberon -down→ OberonSA Oberon -down→ ObjectOberon ObjectOberon -down→ Oberon2 Oberon2 -down→ OberonL OberonL -down→ CP ObjectOberon -down→ ActiveOberon ActiveOberon -down→ Zonnon Oberon ..> ActiveOberon

ExcelsiorOS .|> Modula2 XDS .|> Modula2 XDS .|> Oberon2

BlackBox .|> CP </uml>