I have another diagram or two to add but I’ve not drawn them yet.
In @nickyn sketch the 3 main elements are disconnected whereas in my sketch they are logically integrated under a single PID, even if the implementation is in several parts with separated responsibilities.
The PID kernel information (PID record attributes) contains all you need to direct you (or your software) to any constituent part. I named them as _sections in my sketch and indicate how each relates to the primary, secondary and tertiary extensions of the extended specimen concept. We just have to decide where each part/_section lives, and who/what is responsible for it.
The permanent (immutable) connection to the physical specimen is made in the authoritative a_section. Otherwise, sections are mutable.