On Sun, Mar 15, 2026 at 9:10 AM Hervé Boutemy <[email protected]> wrote:

> > > so there is no notion of "extending existing namespace": there is one
> > > unique namepsace, with multiple schema versions

Yes. This might help: namespaces are names. They are not vocabularies.
A namespace does not define the names that have that namespace.

It's similar to last names of people. The name "Boutemy" or "Harold"
in no way limits what additional people or first names might exist in
the future that are associated with that last name. Nor does it define
or list what first names exist are associated with that last name
today. Similarly a namespace does not define, list, control, or limit
what names appear in that namespace. A namespace is **not** a schema.
It does not identify a schema. A single namespace might have no schema
at all or many schema written in many different schema languages.

> If I try to look at another case where we have some equivalent namespace
> topic: settings.xml
> https://maven.apache.org/ref/3.9.14/maven-settings/settings.html
>
> in that case, no modelVersion fiel, but changing namespace value is not a
> problem?
> why?

Changing the namespace value is a problem. In this case I just haven't
had a need to think or work much with settings.xml files. If someone
did, this would cause issues. Just because no one happened to notice a
mistake made in one place, doesn't mean it isn't a mistake, and
certainly doesn't mean it isn't a much more problematic mistake in a
more central place.

> And what about Maven repository metadata?
> https://maven.apache.org/ref/3.9.14/maven-repository-metadata/repository-metadata.html
> this one has a modelVersion attribute to the root element...

If it's an attribute, use the attribute. No big deal.

-- 
Elliotte Rusty Harold
[email protected]

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