Actually the "new" comment means "non-standard", as the "new" ones are
not in SMIL 2.0, which is what ODF references. Yay for standards.
Added clarifying comments.
This reverts commit 11c7da74d5633d55c11d1ec04dd0096cb96f88f0.
Change-Id: I0696b731c1a055eaf35c68066dfa6f92e1af06f2