[mb-style] Later version vs. Derivative work

[Nicolás Tamargo de Eguren]

http://wiki.musicbrainz.org/Other_Version_Relationship_Type is
completely outdated / wrong (it seems it was "updated" with recordings
in mind, but it was moved to works, so the page is a disaster).
There are two options here. I'd say a "has derivative work"
relationship is needed for the cases where a link exists, but is not
just a "later version" (for example, "Variations on a Theme of The
Magic Flute" should be linked to The Magic Flute somehow, but it is
clearly not just a "later version" of it… it applies also to pop music
sometimes). I'm not the only one who thinks this, see
http://forums.musicbrainz.org/viewtopic.php?id=2907 for example.
My question is: should "Other Version" be renamed and turned into
"derivative work" (with the same attributes and probably some new ones
that would get added over time) or should it remain and "derivative
work" be added as its parent relationship (instead of the non-usable
"covers and versions" we have now)?

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Nicolás Tamargo de Eguren