"1.2 Normative References reads in part:

• • • • • OBIX Encodings Encodings for OBIX: Common Encodings Version 1.0.
          See link in ""Related work"" section on cover page.

2.2.1 Content Negotiation reads in part:

• • • • • 
          OBIX resources MUST be encoded using MIME types defined by the corresponding encodingas defined by the OBIX Encodings specification.

The lack of a specific reference to same part of OBIX Encodings masks a more fatal error: OBIX Encodings defines a MIME type for JSON and EXI only. It does not define a MIME type for XML.
"