RDF API / model versions

Jonas,

do you think the API draft [1] and digest-based URIs for models
adequately address the need for model versioning that you pointed out in
your last posting [2]? Or is an explicit mechanism still needed in your
view?

[1] http://www-db.stanford.edu/~melnik/rdf/api.html
[2]
http://lists.w3.org/Archives/Public/www-rdf-interest/1999Dec/0012.html