It is not clear what is the relationship between "this namesapce" and "other VML namespaces" Where does this fit into the OOXML namespaces as defined elsewhere. And are there different relationsshipd
If these other VML namesspace are related to the ECMA-376 specification it should be clarified how this relationsship is, otherwise remove the reference to "other VML namespaces"
Page 4343 line 5 Part 4 Section 6.1
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Proposed Disposition of DIS 29500 Comment DK-0092 (Modified: 2007-12-05) Agreed; the following change will be made to Part 4, ยง6.1, page 4,343, line 5: Other VML The urn:schemas-microsoft-com:office:office , urn:schemas-microsoft-com:office:word , urn:schemas-microsoft-com:office:excel and urn:schemas-microsoft-com:office:powerpoint namespaces define elements that layer on information beyond the baseline graphical definition. Similar Comments: DE-0137 , GB-0479 , PT-0106

Why are they defining namespaces for stuff that Excel, Powerpoint and Word can do that layers on information beyond the baseline? I thought OOXML was intended to capture all the idiosyncrasies of the legacy formats, plus all the idiosyncrasies of new office applications.