Content stream media type: is it xml or mime type of document?

The ReSTful AtomPub Binding 62a.doc section 8.7 reads,

Media Type: Mime/Type of resource (mime type of content stream on document)

This leads me to believe the stream returns the document itself without any Atom or XML wrapping.

However, the CMIS-Core.xsd defines cmisContentStreamType (though without an element name), which is XML that wraps the document, which is encoded as base64Binary.