# This ontology.
@prefix like:     <http://ontologi.es/like#> .

# Related.
@prefix rev:      <http://purl.org/stuff/rev#> .

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## EXAMPLE USAGE:
##
## Super-easy method:
##
##   <#me> like:likes <http://dbpedia.org/resource/Coldplay> .
##
## Or providing a rating (between 0.0 and 5.0):
##
##   <#me> like:opinion
##              [ a like:Opinion ;
##                like:regarding <http://dbpedia.org/resource/Coldplay> ;
##                rev:rating 4.5 ] .
##
## Here, no rating is provided, but all PositiveOpinions have a rating
## of more than 3.0 by definition:
##
##   <#me> like:opinion
##              [ a like:PositiveOpinion ;
##                like:regarding <http://dbpedia.org/resource/Coldplay> ] .
##
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# Stock imports.
@prefix cc:       <http://creativecommons.org/ns#> .
@prefix dc:       <http://purl.org/dc/terms/> .
@prefix dcmitype: <http://purl.org/dc/dcmitype/> .
@prefix foaf:     <http://xmlns.com/foaf/0.1/> .
@prefix link:     <http://www.w3.org/2006/link#> .
@prefix owl:      <http://www.w3.org/2002/07/owl#> .
@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 vs:       <http://www.w3.org/2003/06/sw-vocab-status/ns#> .
@prefix xhv:      <http://www.w3.org/1999/xhtml/vocab#> .
@prefix xsd:      <http://www.w3.org/2001/XMLSchema#> .

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like: 
	a owl:Ontology ;
	rdfs:label "Ultra-simple review vocab"@en ;
	foaf:maker <http://tobyinkster.co.uk/#i> ;
	dc:issued "2009-05-26"^^xsd:date ;
	dc:modified "2010-07-26"^^xsd:date .

like:Opinion
	a owl:Class ;
	rdfs:label "Opinion"@en ;
	rdfs:subClassOf
		rev:Review ,
		[
			a owl:Restriction ;
			owl:onProperty rev:maxRating ;
			owl:hasValue 5.0
		] ,
		[
			a owl:Restriction ;
			owl:onProperty rev:minRating ;
			owl:hasValue 0.0
		] ,
		[
			a owl:Restriction ;
			owl:onProperty rev:rating ;
			owl:maxCardinality 1
		] .

like:PositiveOpinion
	a owl:Class ;
	rdfs:label "Positive Opinion"@en ;
	rdfs:subClassOf
		like:Opinion ,
		[
			a owl:Restriction ;
			owl:onProperty rev:rating ;
			rdfs:comment "Rating > 3.0"@en
		] .

like:NegativeOpinion
	a owl:Class ;
	rdfs:label "Negative Opinion"@en ;
	rdfs:subClassOf
		like:Opinion ,
		[
			a owl:Restriction ;
			owl:onProperty rev:rating ;
			rdfs:comment "Rating < 2.0"@en
		] .

like:opinion
	a owl:Property ;
	rdfs:label "opinion"@en ;
	rdfs:subPropertyOf [ owl:inverseOf rev:reviewer ] ;
	rdfs:domain foaf:Person ;
	rdfs:range like:Opinion .

like:regarding
	a owl:Property ;
	rdfs:label "regarding"@en ;
	rdfs:subPropertyOf [ owl:inverseOf rev:hasReview ] ;
	rdfs:domain like:Opinion ;
	rdfs:range owl:Thing .

like:likes
	a owl:Property ;
	rdfs:label "likes"@en , "❤" ;
	rdfs:domain foaf:Person ;
	rdfs:range owl:Thing .

like:dislikes
	a owl:Property ;
	rdfs:label "dislikes"@en ;
	rdfs:domain foaf:Person ;
	rdfs:range owl:Thing .

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# Imply flattened form from reified form.
{ ?person like:opinion [ a like:PositiveOpinion ; like:regarding ?thing ] . }
	=> { ?person like:likes ?thing . } .
{ ?person like:opinion [ a like:NegativeOpinion ; like:regarding ?thing ] . }
	=> { ?person like:dislikes ?thing . } .

# Imply reified form from flattened form.
{ ?person like:likes ?thing . }
	=> { ?person like:opinion [ a like:PositiveOpinion ; like:regarding ?thing ] . } .
{ ?person like:dislikes ?thing . }
	=> { ?person like:opinion [ a like:NegativeOpinion ; like:regarding ?thing ] . } .

# An Opinion with a high enough score is a PositiveOpinion.
{ ?op a like:Opinion ; rev:rating ?score . ?score <http://www.w3.org/2000/10/swap/math#greaterThan> 3.0 . }
	=> { ?op a like:PositiveOpinion . } .
{ ?op a like:Opinion ; rev:rating ?score . ?score <http://www.w3.org/2000/10/swap/math#lessThan> 2.0 . }
	=> { ?op a like:NegativeOpinion . } .

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