DOMAIN in genetics:
“A specific physical region or amino acid sequence in a protein which is associated with a particular function or corresponding segment of DNA.”
Good. More backup that my principle (of principles of domains) can 1) be sequences (here of amino acids but musical notes for a melody, or list of rules or axioms)
2) be a specific physical region
3) can be associated with a function (principle and applied – that is, testable)