type-safe, non-general API that covers RDF 1.1

 Commons RDF aims to provide a common library for RDF 1.1 with implementations
 for common Java RDF frameworks like RDF4J, Apache Jena as well as for other
 libraries such as OWLAPI, Clerezza and other JVM languages.
 .
 The main motivation behind this simple library is to revise an historical
 incompatibility issue between these toolkits. This library does not pretend to
 be a generic API wrapping those libraries, but is a set of common Java
 interfaces for the RDF 1.1 concepts, e.g. 'IRI', 'BlankNode', 'Graph',
 accompanied with unit test cases for their expected behaviour, and a 'simple'
 implementation, which main purpose is to clarify the tests and interfaces.