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On 15.6.2018 8:54, David Carlisle d.p.carlisle@xxxxxxxxx wrote:
> This was discussed at great length when namespaces were
> introduced. Although some vocabularies chose to change the
> namespace at version changes it's a really bad idea. If you change
> the namespace then you change the name of every construct in the
> language, that isn't a new version it is a new, incompatible,
> language.

And just to extend this little bit -- fact that namespace change
creates new incompatible language is often used for versioning. As
long as new versions of vocabulary are backward compatible and
semantics of individual element is not changed then namespace is not
changed. But when breaking change has to be included into vocabulary
then namespace should be changed to make sure that old tools will
break on a new "incompatible" content. This is quite common pattern
especially in data-exchange vocabularies. But XSLT
versioning/namespace policy is based on a similar idea.

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