[CMake] How does :: actually works?

[Klaim - Joël Lamotte]

Hi,

I tried several times now to find documentation about how to define
and use target names which seem to have namespaces, like Qt ones.

For example: add_executable( MyProject::some_target ... )

I can't find any documentation or even name for this.
Is it considered a "namespace"?
In any way I found nothing specific to this syntax in the wiki.

Help?
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