This definition describe interleaving parts, but from part 1 Section 9.1.5 ( page 16 line 27) we have, that Office Open XML files are not interleaved, and from Part 2 Section 1 ( page 1 line 2-3) we, have the scope of part 2 is the specification set that are used by Office Open XML, so it should not include any reference to "interleaving"

Not a necessary part of the information specification.

Page 4
line 1-3 Part 2
Section 3

Ed

Proposed Disposition of DIS 29500 Comment DK-0107 (Modified: 2008-01-04) Agreed; the Open Packaging Conventions (OPC) can be used in contexts other than DIS 29500, and OPC should be available for reference and re-use on its own. This has been addressed in the disposition to NB comments DE-0120, DK-0059 through DK-0063, KE-0003, US-0021, US-0253 and others, which proposes that DIS 29500 be made into a multi-part standard with the existing Part 2 (Open Packaging Conventions) restructured as DIS 29500-2. This will allow for re-use of OPC by other standards, which may choose to use additional features of OPC that are not used by DIS 29500. In addition to this, there are no longer any additional constraints placed upon OPC that are specific to the Open XML formats. This is handled by the proposed resolution to CA-0007, CO-0004, DE-0004, DK-0099, FR-0009, GB-0036, KE-0017, PT-0027, and US-0031. Similar Comments: DE-0142 , DK-0054 , FR-0028 , GB-0050 , KE-0081 , US-0019