Your namespace can be any desired capitalization. I personally do all the caps as an indicator that this is a namespace, but this is just my personal style and probably too much if the namespace name would be long and a few words. The examples you show are great (unless you use "MyNamespace" literally, but choose your name).
And the idea of ββthe namespace is to choose something that is very likely to be unique to your application, and therefore unlikely to conflict with what happens in other places.
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