The issue there is the complexity is necessary for some cases which are not met ...

HdS84 · on Aug 21, 2023

And that could not be handled by making an optional namespace which can be used when it is actually needed?

Even without namespaces, it's trivial to handle { "NamespaceA": {....}, "NamespaceB": {....}, }

There is seldom need to mix it in the same object, and if you need that, you should think long and hard if you are on the right track.

pasc1878 · on Aug 21, 2023

Isn't that what XML did - you only put the namespace in if it was needed.

As for multiple ones in the same object it makes sense if you want to reuse a definition used elsewhere e.g. to add an address using a predefined address type. It is like using structures/records in programming languages but with no pointers for composition.