How can generalized RDF triples easier show "the completeness of the RDFS entailment rules", and what does that even mean? -

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the w3c recommendation rdf 1.1 concepts , abstract syntax defines generalized rdf triple (i.e., non-standard triple each of subject/predicate/object can iri/bnode/literal).

about possible use, gives example:

it convenient loosen requirements on rdf triples. example, completeness of rdfs entailment rules easier show generalization of rdf triples.

what "completeness of rdfs entailment rules" mean? (searching "complete" or "entail" in w3c recommendation rdf schema 1.1 doesn’t give results.)

and in way easier show generalized rdf triples normative rdf triples?

these notions explained , defined in detail in rdf semantics, in appendix entailment rules.

completeness, in context, refers completeness of doing entailment checking computation of deductive closure via entailment rules.

suppose have 2 rdf graphs (s , e), , s logically entails e, closure complete if can derive e s. in appendix mentioned above, shown not case rdf-entailment , rdfs-entailment: triples logically entailed can not derived entailment-checking strategy. shown if notion of "generalized rdf" added mix, strategy is complete.

in other words, reason process not complete things true can not derived, due syntactical restrictions on triples (literals can't subjects, , blank nodes can't predicates), cause of entailment patterns not apply, though logically should apply.

an example. suppose have graph:

:p rdfs:subpropertyof _:b . _:b rdfs:domain :c . :a :p :x .

due semantics of rdfs:subpropertyof , rdfs:domain, graph logically entails (under rdfs semantics):

:a rdf:type :c .

however, triple not entailed applying entailment rules defined in section 9.2.1 - reason being requires derivation (via rule rdfs7) of intermediate result :a _:b :x, blank node _:b not allowed in position in 'normal' rdf.

coming original question, find phrasing "the completeness [...] easier show generalization" odd arguably entailment rules aren't complete, unless allow generalization.


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