Github user afs commented on the issue:
https://github.com/apache/commons-rdf/pull/30
@ansell mentions one of the reasons the wording for RDF 1.1is not so direct
- RDF 1.0 did not sanction the common normalization defined in BCP47
canonicalization, although that actually requires consulting the registry as
well.
Jena is lax by default, and retains the form as originally written. In
practice, datasets seem to be internally consistent, all lower case or all
syntax-canonical.
Variations of case are different nodes in the general case but are
`Node.sameValue` (compare) and cause matching in graph.find. Some storage
layers may differ and canonicalize the form, in order to index.
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