By Scot Becker on 7/30/2004

Adding a frequency constraint to a role means that once the role is populated with a given object instance, that same object instance must populate the role between some minimum and some maximum number of times. Read More...

By Scot Becker on 7/28/2004

The Visio for Enterprise Architects (VEA) constraint editor can be a little confusing when it comes to creating set (subtype, equality, and exclusion) constraints. I’ll describe how to create these constraints using examples from a related entry. Read More...

By Scot Becker on 7/1/2004

I thought I would write up a quick post about my favorite ORM constraint. I like this one because it expresses non-trivial business rules, comes up frequently, and is mostly impossible in the (non-note) constraints supported by ER/UML. Read More...