The ORM Foundation

If that helps, I am happy to provide an example of what I’m trying to do.  Fact Type 1: Person(.id) can ensure Outcome(.id) Fact Type 2: Person(.id) has Plan(.id) to realize Outcome(.id) Fact Type 3: Person(.id) has contracted Person(.id) to realize Outcome(.id) I want to express two subset constraints in inclusive or so as to say: ...

Thank you for your reply. I'm not sure what you're talking about would look like in ORM. Could you enlighten me? The only way I can think of is to objectify the two relationships and then connect them in inclusive or with a subtype to a third that represents the union. The problem is that if not all relationships involved have the same ...

You're right; I should have explained my problem a little more. Let's say I have three fact types: Fact Type 1. [A, B]  Fact Type 2.  [A, B]             Fact Type 3.  [A, A, B] I want to express that the couple in bold, [A, B], present in Fact Type 1, ...

I am having trouble in NORMA because I would like to add an inclusive or between two subset constraints. That is, I want to model the idea that if I have a couple of entities that are present in a given relationship, that same couple must be present in at least one of two other relationships but not necessarily both. Is there a way in ORM to model ...