1.3.1 MIME Parts Ordering in Multipart/Related XOP Package Extension

The standard XOP implementation, as specified in [XML-XOP] section 4.1, is not allowed to consider the ordering of MIME parts to be significant to XOP processing or to the construction of the XOP Information Set (XOP Infoset) for MIME Multipart/Related packaging. The XML-binary Optimized Packaging (XOP) Profile extends the MIME Multipart/Related packaging mechanism specified in [XML-XOP] to allow for the ordering of the MIME parts, as described in section 2.2.1. These extensions enable the creation of more efficient implementations for processing an XML Infoset packaged in MIME Multipart/Related XOP packages when streaming.