GitHub user afs added a comment to the discussion: Is `https://` a valid IRI
according to RFC 3986?
Hi Barry,
Which version are you upgrading from?
You should be able to use `IRIx` and not need to use IRI3986 as of Jena 6.0.0
It is "absolute" - RFC 3986 URI syntax allows the `hier-part` to have a `host`
that is an empty string for `reg-name`.
However, that's just the basic syntax. Mistakes in URI syntax are exceptions.
URI schemes are layered on top of the URI syntax.
https/http (also defined in RFC 3986) require a non-empty host - that's
https/http specific.
Jena will parse that and print a warning for errors in scheme-specific rules.
Parser errors are fatal errors.
```
IRIx iri = IRIx.create("https://";);
iri.handleViolations((err,str)->System.out.printf("Error=%s :
%s\n",(err?"yes":"no"),str));
System.out.println(iri.isReference());
```
prints
```
Error=yes : <https://> http and https URI schemes do not allow the host to be
empty
true
```
the "isReference" value is a Jena bug (#3825). It should be false.
RDF 1.2 Concepts introduces RDF Reference IRIs" in [section
3.3.1](https://www.w3.org/TR/rdf12-concepts/#reference-iris).
These are advisory - and includes the advice "follow the URI scheme rules".
`IRIX.isReference` needs to be brought up-to-date.
GitHub link:
https://github.com/apache/jena/discussions/3824#discussioncomment-16397719
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