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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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#------------------------------------------------------------------
# Micro ruleset for DAML. This is just the core RDFS rules plus
# the extensional rules for domain/range, plus some DAML axioms.
# $Id: daml-micro.rules,v 1.7 2005/04/06 23:07:17 ian_dickinson Exp $
#------------------------------------------------------------------

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

-> tableAll().

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

[rdfs2:  (?p rdfs:domain ?c) -> [(?x rdf:type ?c) <- (?x ?p ?y)] ]
[rdfs3:  (?p rdfs:range ?c)  -> [(?y rdf:type ?c) <- (?x ?p ?y)] ]
[rdfs5b: (?a rdf:type rdf:Property) -> (?a rdfs:subPropertyOf ?a)]
[rdfs6:  (?p rdfs:subPropertyOf ?q), notEqual(?p,?q) -> [ (?a ?q ?b) <- (?a ?p ?b)] ]
[rdfs7:  (?a rdf:type rdfs:Class) -> (?a rdfs:subClassOf ?a)]
[rdfs10: (?x rdf:type rdfs:ContainerMembershipProperty) -> (?x rdfs:subPropertyOf rdfs:member)]

[rdfs2-partial: (?p rdfs:domain ?c) -> (?c rdf:type rdfs:Class)]
[rdfs3-partial: (?p rdfs:range ?c)  -> (?c rdf:type rdfs:Class)]

# 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)]


#------------------------------------------------------------------
# RDFS iff extensions needed for OWL
#------------------------------------------------------------------

[rdfs2a: (?x rdfs:domain ?y), (?y rdfs:subClassOf ?z) -> (?x rdfs:domain ?z)]
[rdfs3a: (?x rdfs:range  ?y), (?y rdfs:subClassOf ?z) -> (?x rdfs:range  ?z)]

#------------------------------------------------------------------
# Some useful daml axioms
#------------------------------------------------------------------

-> (daml:subPropertyOf rdfs:subPropertyOf rdfs:subPropertyOf).
-> (rdfs:subPropertyOf rdfs:subPropertyOf daml:subPropertyOf).

-> (daml:subClassOf rdfs:subPropertyOf rdfs:subClassOf).
-> (rdfs:subClassOf rdfs:subPropertyOf daml:subClassOf).

-> (daml:type rdfs:subPropertyOf rdf:type).
-> (rdf:type rdfs:subPropertyOf daml:type).

-> (daml:value rdfs:subPropertyOf rdf:value).
-> (rdf:value rdfs:subPropertyOf daml:value).

-> (daml:domain rdfs:subPropertyOf rdfs:domain).
-> (rdfs:domain rdfs:subPropertyOf daml:domain).

-> (daml:range rdfs:subPropertyOf rdfs:range).
-> (rdfs:range rdfs:subPropertyOf daml:range).

-> (daml:label rdfs:subPropertyOf rdfs:label).
-> (rdfs:label rdfs:subPropertyOf daml:label).

-> (daml:comment rdfs:subPropertyOf rdfs:comment).
-> (rdfs:comment rdfs:subPropertyOf daml:comment).

-> (daml:Literal rdfs:subClassOf rdfs:Literal).
-> (rdfs:Literal rdfs:subClassOf daml:Literal).

-> (daml:Property rdfs:subClassOf rdf:Property).
-> (rdf:Property rdfs:subClassOf daml:Property).

-> (daml:ObjectProperty rdfs:subClassOf rdf:Property).
-> (daml:DatatypeProperty rdfs:subClassOf rdf:Property).

# need this rule so that improved individual detection code works with DAML sources
# [thing1: (?x rdf:type ?C), (?C rdf:type daml:Class) -> (?x rdf:type daml:Thing)]
[thing1: (?C rdf:type daml:Class) -> (?C rdfs:subClassOf daml:Thing)]
-> (daml:Thing rdf:type daml:Class).