@prefix :   	<http://example.com/ins_uebung/#> .
@prefix rdf:	<http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix xsd:	<http://www.w3.org/2001/XMLSchema#> .
@prefix rdfs:   <http://www.w3.org/2000/01/rdf-schema#> .
@prefix foaf:	<http://xmlns.com/foaf/0.1/> .
@prefix rev:	<http://purl.org/stuff/rev#> .
@prefix owl:    <http://www.w3.org/2002/07/owl#> .

[rule1: (?con rdf:type :GameConsole) (?con :predecessorOfConsole ?otherCon)
    noValue(?otherCon :successorOfConsole ?con)
    -> (?otherCon :successorOfConsole ?con)]

[rule2: (?con :hasPrice ?someValue)
    -> remove(0)]

[rule3: (?con rev:hasReview ?rev) (?rev rev:reviewer ?reviewer)
    -> (?reviewer :hasReviewedConsole ?con)]