Just flagging this for the future: the current registration in §G.1 for the application/oebps-package+xml Media Type says

The Package Document and its related specifications are maintained and defined by the W3C’s EPUB 3 Community Group.

This may have to be updated to say instead:

The Package Document and its related specifications are maintained and defined by the World Wide Web Consortium (W3C).

Actually, this is exactly what §G.2 says for the application/epub.zip media type. Not sure why we have a discrepancy.