I have learnt to draw class diagrams like this:
┌────────┐ │ Animal │ └────────┘ Δ ┌──┴───┐ ┌──┴──┐┌──┴──┐ │ Cat ││ Dog │ └─────┘└─────┘
Is this possible in PlantUML?
I originally asked about this on StackOverflow
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already answered on StackOverflow