Registration of media types application/xacmlpolicy+xml, application/xacmlrequest+xml, and application/xacmlresponse+xml

Hello,

I've been authorized [1] by the OASIS XACML Technical Committee to register 3 media types: application/xacmlpolicy+xml, application/xacmlrequest+xml, and application/xacmlresponse+xml and have a question about the registration process [2]. Section 4.10 states:

"standards tree registrations for media types defined in documents produced by other standards bodies MUST be described by a formal standards specification produced by that body."

Does that mean we first have to have a committee specification that prescribes the use of a media type, before we can register said media type with IANA?

Thanks,
Ray

[1] http://lists.oasis-open.org/archives/xacml/201112/msg00006.html
[2] http://tools.ietf.org/html/rfc4288