<attribute name="xmlns"> is a bug
|Component:||Open Container Format (OCF)|
|Status:||completed @ 2.0.1|
in APPENDIX A: RELAX NG OCF Schema is clearly a bug, since 4.16 in the OASIS RELAX NG committee specification disallows "xmlns" here.
A name element that occurs as the first child of an attribute element or as the descendant of the first child of an attribute element and that has an ns attribute with value equal to the empty string must not have content equal to xmlns.
Insert resolution here.