1.2.1 Normative References

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[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997, https://www.rfc-editor.org/info/rfc2119

[RFC2387] Levinson, E., "The MIME Multipart/Related Content-type", RFC 2387, August 1998, https://www.rfc-editor.org/info/rfc2387

[XML-XOP] Gudgin, M., Mendelsohn, N., Nottingham, M., and Ruellan, H., "XML-binary Optimized Packaging", January 25, 2005, http://www.w3.org/TR/2005/REC-xop10-20050125