I’m trying to understand the various types of references that two objects can have in a Genexus knowledge base.

For example:

KBObject obj = KBObject.Get(objRef.Model, r.From);

r.ReferenceType ??
r.LinkType ??
r.LinkTypeInfo ??

What do ReferenceType (Hard, Weak, WeakExternal, etc.), LinkType (1, 2, 4, etc.), and LinkTypeInfo (BL, R1I1U1B1, etc.) mean?

I’ve searched through the documentation and code examples, but I couldn’t find any relevant information. Could someone provide an explanation or point me to relevant documentation or code examples?