The W3C Recommendation RDF 1.1 Concepts and Abstract Syntax defines what a generalized RDF triple is (i.e., a non-standard triple where each of subject/predicate/object can be a IRI/bnode/literal).
About its possible use, it gives this example:
It is sometimes convenient to loosen the requirements on RDF triples. For example, the completeness of the RDFS entailment rules is easier to show with a generalization of RDF triples.
What does "completeness of the RDFS entailment rules" mean? (Searching for "complete" or "entail" in the W3C Recommendation RDF Schema 1.1 doesn’t give any results.)
And in which way is this easier to show with generalized RDF triples than with normative RDF triples?