I am continue to investigate using Dia for ERD designs.

Now I have stumbled across the ER charts missing the inheritance
functionality, denoted by "ISA" which is a triangle pointing upwards,
connecting between something like "Employee" entity  and inheriting
entities such as "Hourly Employee" and "Contract Employee".

So, please tell me I missed something, and there is a way to do those ER
things in Dia :)


Thanks!
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