From Music Ontology Wiki
14:02 < Shepard> yvesr: one problem I see in the use of FRBR. mo:Medium is an frbr:Item, so the real thing I hold in my hand. however I
want to describe mediums on a higher abstraction level
14:03 < Shepard> all releases with the same barcode should contain the same kind of medium. normally (when it's a CD) they're even pressed
from the same master CD, so they have the same TOC and the same IFPI codes (the barely readable numbers on the inner ring
on the back of the CD)
14:05 < Shepard> there are exceptions to that, I have seen releases with identical barcodes but different TOCs or just different IFPI
codes, but still I think it's worth describing a group of releases and not just the one I own
14:05 < Shepard> second I don't see how you can do multi-disc releases at all
14:06 < Shepard> then I want to describe albums as a kind of work from which there are manifestations which are the different
releases/editions
14:07 < Shepard> then I want to describe releases as packages (what catalogue numbers and barcodes do they have, what cases do they use,
what mediums do they contain)
14:09 < Shepard> and a release could either have a whole album on one CD, an album split on multiple CDs or even contain multiple albums on
multiple CDs (single box sets for example). and mediums can have audio tracks and data tracks, or a audio side and a DVD
side or a super audio side which contains the whole album again
14:18 < Shepard> those IFPI codes are really something only hardcore collectors care about - and it's impossible to get releases with
different IFPI codes anyway, so this might be something only useful for describing on the item level. the TOCs however are
in musicbrainz and are very useful data across items
