object-role-modeling

Visiomodeler/NORMA - Object Role Modeling (the other ORM) - who uses it?

For a number of years I've used Object Role Modeling to design and validate my database schema designs. (The appurtenant software products have been variously named Visiomodeler, Infomodeler, Visual Studio Enterprise Architect ORM Studio, etc.) It's the only truly conceptual database modeling tool I've ever found to be at all useful; in...

Dynamic Types within a Relational Model using Object-Role-Modeling (ORM)

In Object Role Modeling (ORM), given an entity of thing that had a relationship to an entity of type and where the type entity can be specified to live and the thing entity could have a value for date of birth, how would I specify a constraint that would exclude instances of thing from having a value for date of birth if the instance of ...