The OPC is not dependent on other parts of Office Open XML. The specification clearly has applicability outside the confines of OOXML. Indeed the same OPC is used by the Microsoft XML Paper Specification (XPS) which is also being developed by ECMA

The Open Packaging Convention (OPC) should be separated from the, already bulky, DIS29500 and presented for consideration as a separate standard. There is a significant need for an international standard in this area.

Part 2, Open Packaging Convention

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Proposed Disposition of DIS 29500 Comment ZA-0006 (Modified: 2007-12-27) Agreed. DIS 29500 has two parts that lend themselves to use by other standards: Part 2 (Open Packaging Conventions) and Part 5 (Markup Compatibility and Extensibility). In order to allow for normative references to those parts from other standards, we will make DIS 29500 a multi-part standard, as described below. DIS 29500 will be restructured to consist of the following three parts: DIS 29500-1, which contains the existing Part 1 (Fundamentals), Part 4 (Markup Language Reference), and Part 3 (Primer), the latter being moved to an informative annex. (Note: the disposition for comment JP-0030 moves deprecated features [such as VML] from within these three parts to a new annex of DIS 29500-1.) DIS 29500-2, which contains the existing Part 2 (Open Packaging Convention). DIS 29500-3, which contains the existing Part 5 (Markup Compatibility and Extensibility). The conformance clause for each of these three parts will be structured as follows: DIS 29500-1 will have a variation of the existing conformance clause in Part 1, with the concept of conformance classes introduced, and defined for each of the document types: WordprocessingML, SpreadsheetML, and PresentationML. (See the disposition for comments JP-0027, JP-0028, and JP-0029.) DIS 29500-2 will use the existing conformance clause in Part 2. DIS 29500-3 will use a new conformance clause. (See the disposition for comment JP-0080.) Similar Comments: AU-0005 , CL-0039 , CZ-0002 , DE-0120 , DK-0059 , DK-0060 , DK-0061 , DK-0062 , DK-0063 , ECMA-0037 , FI- 0003 , IN-0052 , IN-0054 , JP-0039 , JP-0079 , KE-0003 , NO-0002 , NO-0007 , PT-0008 , PT-0033 , US-0021 , US-0253 ,