stem

When metadating content, you often want to link the precursor i.e. the content it was derived from.

All Creative Work Is Derivative

When there is one clear precursor, I use the stem/ prefix:

title   = "Weird Al" Yankovic - Foil (Official 4K Video)
maker   = alyancovic
youtube = urglg3WimHA

stem/title = LORDE - Royals
stem/maker = Lorde
stem/youtube = LFasFq4GJYM

Sometimes the precursor is not that univocal (because there are two, or so). Then, I also use a slashed prefix, but not the word stem.

youtube = WT1wTHjDd3M
title = Statues dancin' all night long
maker = Nap

music/title = Dancin (Krono Extended Remix)
music/maker = Krono

video/title = All Creative Work Is Derivative
video/maker = Nina Paley
video/youtube = jcvd5JZkUXY

When we do this, we build a tree of derived content.

title = Dancin (Krono Extended Remix)
maker = Krono

stem/title = Dancin
stem/maker = Aaron Smith

slashed prefix

Think of foreign keys in relational databases.