Although you can set most of the other Diagram Attributes in an MDGT you can't set [ ] Show Namespace.
This is probably because [ ] Show Namespace is controlled by the ShowForeign column and not the PDATA or StyleEx columns (which ARE available in the profile).
Reported,
Paolo
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with the same name, leaving a note here to say you've done it
- so we users have an indication of the level of support.