Relationship system tag?

[emyoulation]

In many cases, metadata tagged persons within a collection of photos have well defined relationships to one another.

It would be useful if there was the capacity to define an overall relationship identification system for an image's metadata, a base reference, and then add a relative identifier to each tagged region.

So, let's say that I have a group of 1910 Family Reunion photos. All the tagged persons are descendants of a well-defined proband. The tagged person relationships in the photos can be identified with an arbitrary descendant numbering system. So I uniquely identify the Proband (as an example, a specific WikiTree or FamilySearch ID profile), reference the relationship numbering system (i.e., a Modified Henry defined at a URI), and include the numbering system identifier to each tagged region.

The numbering system could be calculated (like a Ahnentafel number) or more arbitrary (like an employee number, SSN, or a WikiTree ID).

Chances are that, with recent development of automation tools for virus contact tracing, other complex relationship identifier systems could be leveraged.