>   In which ways is this set of names not a namespace?

It could have been defined as being a namespace but the namespace REC (in 5.2) says

If the URI reference in a default namespace declaration is empty, then
unprefixed elements in the scope of the declaration are not considered
to be in any namespace.

which explictly says that that set is _not_ a namespace, so presumably
it isn't.

David

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