@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix xl: <http://www.w3.org/2008/05/skos-xl#> .
@prefix org: <http://www.w3.org/ns/org#> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix unvoc: <http://metadata.un.org/schema/> .

###############################################################################
# This is a provisional ontology schema for use in attempting to capture the 
# UN's various information classification activities. All of the classes and 
# properties asserted here represent a best effort to rationalize the current
# and historic practices of the librarians and other information managers of 
# the United Nations. We make no guarantees about completeness or accuracy.
###############################################################################

#### Ontology
unvoc: a owl:Ontology ;
  dcterms:title "UN Semantic Ontology"@en ;
  dcterms:description "An ontology for semantic description of various UN resources."@en ;
  # The version information will change regularly once we move from a provisional status.
  dcterms:hasVersion "20180601-provisional" .
  
### OWL Classes

## Collective Classes

###############################################################################
# These are the class definitions for root elements, such as thesauri, member 
# lists, document collections, etc. Every instance of a class that collects 
# something should either be defined here or make use of an existing RDF 
# schema. Note that these can also be collections of collections. Note also 
# that these aren't strictly necessary, but are practical.
###############################################################################

unvoc:Thesaurus a rdfs:Class , owl:Class ;
  rdfs:subClassOf skos:ConceptScheme .

unvoc:MemberStates a rdfs:Class , owl:Class ;
  rdfs:subClassOf skos:ConceptScheme .

unvoc:Bodies a rdfs:Class , owl:Class ;
  rdfs:subClassOf skos:ConceptScheme .

unvoc:Documents a rdfs:Class , owl:Class ;
  rdfs:subClassOf skos:ConceptScheme .

## Individual Classes

###############################################################################
# These are class definitions for the kinds of individual resources that make 
# up the collective classes defined above. For instance, a unvoc:Thesaurus 
# ultimately contains skos:Concept instances and a unvoc:MemberStates 
# collection ultimately contains instances of unvoc:MemberState.
###############################################################################

# This differentiates geographic terms from general subject terms, although a term may be of both classes
unvoc:GeographicTerm a rdfs:Class , owl:Class ;
  rdfs:subClassOf skos:Concept .

# This differentiates place names from general subject terms, although a term may be of both classes  
unvoc:PlaceName a rdfs:Class , owl:Class ;
  rdfs:subClassOf skos:Concept .

unvoc:MemberState a rdfs:Class , owl:Class ;
  rdfs:subClassOf skos:Concept .

unvoc:Document a rdfs:Class , owl:Class ;
  rdfs:comment "Documents refer to specific outputs produced by the United Nations and its constituent bodies and organs."@en .
  #rdfs:subClassOf skos:Concept .

unvoc:Membership a rdfs:Class , owl:Class .
  #rdfs:subClassOf sorg:Event ??

unvoc:Body a rdfs:Class , owl:Class ;
  rdfs:subClassOf org:Organization .

## DatatypeProperties

unvoc:useStart a rdfs:Property , owl:DatatypeProperty ;
  rdfs:comment "Begin date for the use of a particular label."@en ;
  rdfs:domain xl:Label ;
  rdfs:range xsd:date .

unvoc:useEnd a rdfs:Property , owl:DatatypeProperty ;
  rdfs:comment "End date for the use of a particular label."@en ;
  rdfs:domain xl:Label ;
  rdfs:range xsd:date .

unvoc:membershipYear a rdfs:Property , owl:DatatypeProperty ;
  rdfs:comment "Date associated with a membership event, such as for ."@en ;
  rdfs:range dcterms:date .

## ObjectProperties

unvoc:membership a rdfs:Property , owl:ObjectProperty ;
  rdfs:comment "Denotes a membership event, generally on the part of a Member State, and generally in a UN Body."@en ;
  rdfs:range unvoc:Membership .

unvoc:referringDocument a rdfs:Property , owl:ObjectProperty ;
  rdfs:comment "Denotes a document that refers to a particular membership event."@en ;
  rdfs:domain unvoc:Membership ;
  rdfs:range unvoc:Document .