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Jena is a Java framework for building Semantic Web applications. It provides a programmatic environment for RDF, RDFS and OWL, SPARQL and includes a rule-based inference engine.

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#------------------------------------------------------------------
# RDFS rule set v0.1.
# This variant is used in the case where the subclass and subproperty
# lattices have been precomputed by a transitive graph closure cache.
# and only includes the minimum useful core rules with no axioms.
# $Id: rdfs-fb-tgc-simple.rules,v 1.4 2009/03/09 18:10:16 der Exp $
#------------------------------------------------------------------

#------------------------------------------------------------------
# Tabling directives
#------------------------------------------------------------------

-> tableAll().

#------------------------------------------------------------------
# RDFS Closure rules
#------------------------------------------------------------------

[rdfs7b: (?a rdf:type rdfs:Class) -> (?a rdfs:subClassOf rdfs:Resource)] 
[rdfs5b: (?a rdf:type rdf:Property) -> (?a rdfs:subPropertyOf ?a)] 

[rdfs2:  (?p rdfs:domain ?c) -> [(?x rdf:type ?c) <- (?x ?p ?y)] ] 
[rdfs3:  (?p rdfs:range ?c)  -> [(?y rdf:type ?c) <- (?x ?p ?y)] ] 
[rdfs6:  (?p rdfs:subPropertyOf ?q), notEqual(?p,?q) -> [ (?a ?q ?b) <- (?a ?p ?b)] ] 

# Either version should work, pure back one scales better.
# rdfs9:  (?x rdfs:subClassOf ?y) -> [ (?a rdf:type ?y) <- (?a rdf:type ?x)] ] 
[rdfs9-alt:  (?a rdf:type ?y) <- (?x rdfs:subClassOf ?y), (?a rdf:type ?x) ] 

# Not needed - replaced by TGC front end
#[rdfs8:  (?a rdfs:subClassOf ?b), (?b rdfs:subClassOf ?c) -> (?a rdfs:subClassOf ?c)] 
#[rdfs5a: (?a rdfs:subPropertyOf ?b), (?b rdfs:subPropertyOf ?c) -> (?a rdfs:subPropertyOf ?c)]