Section 4 Page 20 ipAddressOrigin: The lack of an origin identifier
for multicast is unclear. Could anyone please elaborate on this
issue?

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Bill:

MLD handles multicast, including statically joined groups.
e.g. RFC 3019's
mldCacheSelf.ff.02.00.00.00.00.00.00.00.00.00.00.00.00.00.02.1 = True
to join ff02::2 on interface 1.