Given what you write below, it looks like this has changed recently.
Do you have a pointer to the decision record ? Do you know the RFC
number ? Do you know when it will be published ?
The IESG has approved publication of the I-D as a Proposed Standard.
Here is the pointer to the decision.
http://www.ietf.org/iesg/iesg.2K-10-05
2. The IESG approved publication of XML Media Types
<draft-murata-xml-09.txt> as a Proposed Standard. Steve to send
announcement.
Cheers,
IBM Tokyo Research Lab &
International University of Japan, Research Institute
MURATA Makoto