From the commits list, and JENA-816, you may have noticed I've started
working through the RDF 1.1 isms.
There is a flag in JenaRuntime to control the system mode and a test in
the jena-core to stop that building with the RDF 1.1 mode set.
The test suites don't yet pass in RDF 1.1 mode - there is code that
makes reasonably but RDF 1.0 assumptions about xsd:string not being the
same as simple literals, and datatype code not being aware that language
tags imply a datatype of rdf:langString.
No work on the persistent storage implications yet.
Andy