2.2.1 Ordering of the MIME Parts in XOP Packages

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The extensions provided by the XML–binary Optimized Packaging (XOP) Profile override the following text located in [XML-XOP] section 4.1:

"Except for purposes of determining the root MIME part, as specified by [RFC2387], ordering of MIME parts MUST NOT be considered significant to XOP processing or to the construction of the XOP Infoset."

In streaming mode negotiated through a process that is out of band to this protocol, the root MIME part MUST appear first in a MIME Multipart/Related XOP package, and the subsequent MIME parts MUST appear in the order in which they appear in the corresponding XML Infoset.<1>