The definition is using VML instead of the newer and richer DrawingML to define. Since Part 4, section 6. page 4343 indicate, the VML is "deprecated" and shouldn’t be used in the ECMA-376 Office Open XML specification, it is of major concern that the specification actual is encouraging the adoption of VML specification for specific features
We would expect a more rigid adoption of the best practice implied by ECMA, and would expect a wider usage of the DrawingML to provide a more stable realization of the specification.

VML should be maintained in the specification solely for backwards compatibility reasons and it should be maintained that the usage of VML is "deprecated". We strongly suggest that future versions of DrawingML should be extended to become a full superset of VML and subsequently no distinct parts of the specification should rely on VML, but instead utilize this extended DrawingML..

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Proposed Disposition of DIS 29500 Comment DK-0006 (Modified: 2008-01-03) Agreed; deprecated markup should not be required in Part 4, §2.3.3.19 and §2.3.3.21 (or at any other location within WordprocessingML). At each location where VML is required, VML will be deprecated and replaced with an alternative in the DrawingML format. This is addressed in detail within the disposition of the following comments: CA-0076, CL-0025, CL-0206, CO-0076, CO-0223, CZ-0004, CZ-0011, DE-0018, DE-0020, DE-0021, DE-0115, DE-0116, DK-0058, DK-0095, DK-0150, 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, and ZA-0016. Similar Comments: CA-0016 , CL-0140 , CO-0085 , CO-0086 , DE-0019 , DE-0022 , DE-0109 , DK-0007 , DK-0008 , DK-0009 , DK- 0022 , FR-0049 , GB-0174 , GB-0178 , GR-0069 , IN-0049 , KE-0048 , KE-0053 , MY-0001 , US-0119 , US-0124 , VE-0014