Implement request #30622: make $namespace parameter functional

This parameter never actually did anything and was forgotten about.
We solve this by detecting when we have a $namespace ar

Implement request #30622: make $namespace parameter functional

This parameter never actually did anything and was forgotten about.
We solve this by detecting when we have a $namespace argument
(that won't conflict with the name argument) and creating a Clark
notation name out of it.

Closes GH-16123.

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