Hi Paolo, > https://en.wikipedia.org/wiki/Coupling_(computer_programming)#:~:text=In%20software%20engineering%2C%20coupling%20is,of%20the%20relationships%20between%20modules
"In software engineering, coupling is the degree of interdependence between software modules; a measure of how closely connected two routines or modules are;[1] the strength of the relationships between modules." So you're trying to apply the definition of "routines and modules" to describe data and how it's referenced in a layout application? ;) I can't spend any more time on this thread — I hope you figure out your solution soon, and stop blaming Lilypond for something it's not actually doing. Cheers, Kieren.