Providing a quick lookup table for relationship types and their Element types constraints

[bact]

RelationshipType vocabulary defines list of values that can be used in relationshipType property in a Relationship class.

To use RelationshipType one also need to know about the classes of the two elements at the two ends of the relationship (to and from).

The current textual description inside an ordered list may work for a short enumeration without additional class constraint information, but there can be an improved way to present such a long and complex list like RelationshipType. So the RelationshipType and compatible to and from can be found and compared quickly.

Before 3.0.1 release, we used to have this table in the model diagrams annex:

[zvr]

This would be a great addition to the https://github.com/spdx/using repo!

[kestewart]

Agree, let's get this into /using/. we can create a version for 3.0, then create an updated version for 3.1.