The reference to the urn:schemas-microsoft-com:vml namespace references VML, which is considered as deprecated (Part 4, page 4343, lines 11&12). A new standard should not contain deprecated parts.
Remove all references to VML from the OOXML text, hence remove the reference to the urn:schemas-microsoft-com:vml namespace here.
page 28, line 0 Part 4, Section 2.2.1
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Proposed Disposition of DIS 29500 Comment US-0118 (Modified: 2008-01-04) Agreed; VML will be moved to an Annex for deprecated features. For detailed information see the response to CA-0076, CO-0076, CO-0223, CZ-0004, CZ-0011, DE-0018, DE-0020, DE-0021, DE-0115, DE-0116, DK-0058, DK-0095, DK-0155, FI-0008, GB-0177, GB-0190, GB-0476, GB-0477, GR-0087, IE-0009, JP-0030, KE-0047, KE-0064, MX-0006, US-0092, US-0152, UY-0002, VE-0013, or ZA-0016. Similar Comments: CL-0008 , IN-0014 , VE-0010 , VE-0073
