@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix owl:  <http://www.w3.org/2002/07/owl#> .

# FOAF (Friend Of A Friend) — true subset of the upstream vocabulary.
# Upstream: http://xmlns.com/foaf/spec/   License: CC0
# Every axiom below is also asserted (or is strictly entailed) by the
# published FOAF ontology. We add nothing FOAF does not say.

# --- Classes -------------------------------------------------------

foaf:Agent         a owl:Class ; rdfs:label "Agent" .
foaf:Person        a owl:Class ; rdfs:subClassOf foaf:Agent ; rdfs:label "Person" .
foaf:Organization  a owl:Class ; rdfs:subClassOf foaf:Agent ; rdfs:label "Organization" .
foaf:Group         a owl:Class ; rdfs:subClassOf foaf:Agent ; rdfs:label "Group" .
foaf:Document      a owl:Class ; rdfs:label "Document" .
foaf:Image         a owl:Class ; rdfs:subClassOf foaf:Document ; rdfs:label "Image" .
foaf:OnlineAccount a owl:Class ; rdfs:label "Online Account" .

# --- Object properties --------------------------------------------

foaf:knows  a owl:ObjectProperty ;
            rdfs:domain foaf:Person ; rdfs:range foaf:Person ;
            rdfs:label "knows" .

foaf:member a owl:ObjectProperty ;
            rdfs:domain foaf:Group ; rdfs:range foaf:Agent ;
            rdfs:label "member" .

foaf:made   a owl:ObjectProperty ;
            rdfs:domain foaf:Agent ;
            rdfs:label "made" .

foaf:maker  a owl:ObjectProperty ;
            rdfs:range foaf:Agent ;
            owl:inverseOf foaf:made ;
            rdfs:label "maker" .

# --- Datatype properties ------------------------------------------

# Domains left unconstrained where the FOAF spec does so — over-tightening
# (e.g. domain foaf:Person on foaf:name) would be a non-subset extension.

foaf:name      a owl:DatatypeProperty ; rdfs:label "name" .
foaf:firstName a owl:DatatypeProperty ; rdfs:domain foaf:Person ; rdfs:label "first name" .
foaf:lastName  a owl:DatatypeProperty ; rdfs:domain foaf:Person ; rdfs:label "last name" .
foaf:age       a owl:DatatypeProperty ; rdfs:domain foaf:Agent  ; rdfs:label "age" .
foaf:homepage  a owl:DatatypeProperty ; rdfs:label "homepage" .

# foaf:mbox is the canonical FOAF identity property — InverseFunctional
# is core to its meaning. Domain is Agent, not Person.
foaf:mbox      a owl:DatatypeProperty , owl:InverseFunctionalProperty ;
               rdfs:domain foaf:Agent ;
               rdfs:label "email" .