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<?xml version="1.0" encoding="UTF-8" ?>
<rdf:RDF
  xml:base = "http://example.com/rsa_example.owl#"
  xmlns:rdf = "http://www.w3.org/1999/02/22-rdf-syntax-ns#"
  xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#" 
  xmlns:owl="http://www.w3.org/2002/07/owl#"
>

    <!-- 
    A ⊑ ∃ R.B
    ∃ R⁻.X ⊑ Y
    B ⊑ ∃ S.C
    ∃ S⁻.X ⊑ Y
    C ⊑ ∃ T.D
    ∃ T⁻.X ⊑ Y
    D ⊑ ∃ P.A
    ∃ P⁻.X ⊑ Y
    -->

    <owl:Class rdf:ID="A">
        <rdfs:subClassOf>
            <owl:Restriction>
                <owl:onProperty rdf:resource="#R"/> 
                <owl:someValuesFrom>
                    <owl:Class rdf:about="#B" /> 
                </owl:someValuesFrom>
            </owl:Restriction>
        </rdfs:subClassOf>
    </owl:Class>

    <owl:Restriction>
        <owl:onProperty>
            <owl:ObjectProperty>
                <owl:inverseOf rdf:resource="#R" />
            </owl:ObjectProperty>
        </owl:onProperty>
        <owl:someValuesFrom>
            <owl:Class rdf:about="#X" /> 
        </owl:someValuesFrom>
        <rdfs:subClassOf rdf:resource="#Y" />
    </owl:Restriction>

    <owl:Class rdf:ID="B">
        <rdfs:subClassOf>
            <owl:Restriction>
                <owl:onProperty rdf:resource="#S"/> 
                <owl:someValuesFrom>
                    <owl:Class rdf:about="#C" /> 
                </owl:someValuesFrom>
            </owl:Restriction>
        </rdfs:subClassOf>
    </owl:Class>

    <owl:Restriction>
        <owl:onProperty>
            <owl:ObjectProperty>
                <owl:inverseOf rdf:resource="#S" />
            </owl:ObjectProperty>
        </owl:onProperty>
        <owl:someValuesFrom>
            <owl:Class rdf:about="#X" /> 
        </owl:someValuesFrom>
        <rdfs:subClassOf rdf:resource="#Y" />
    </owl:Restriction>

    <owl:Class rdf:ID="C">
        <rdfs:subClassOf>
            <owl:Restriction>
                <owl:onProperty rdf:resource="#T"/> 
                <owl:someValuesFrom>
                    <owl:Class rdf:about="#D" /> 
                </owl:someValuesFrom>
            </owl:Restriction>
        </rdfs:subClassOf>
    </owl:Class>

    <owl:Restriction>
        <owl:onProperty>
            <owl:ObjectProperty>
                <owl:inverseOf rdf:resource="#T" />
            </owl:ObjectProperty>
        </owl:onProperty>
        <owl:someValuesFrom>
            <owl:Class rdf:about="#X" /> 
        </owl:someValuesFrom>
        <rdfs:subClassOf rdf:resource="#Y" />
    </owl:Restriction>

    <owl:Class rdf:ID="D">
        <rdfs:subClassOf>
            <owl:Restriction>
                <owl:onProperty rdf:resource="#P"/> 
                <owl:someValuesFrom>
                    <owl:Class rdf:about="#A" /> 
                </owl:someValuesFrom>
            </owl:Restriction>
        </rdfs:subClassOf>
    </owl:Class>

    <owl:Restriction>
        <owl:onProperty>
            <owl:ObjectProperty>
                <owl:inverseOf rdf:resource="#P" />
            </owl:ObjectProperty>
        </owl:onProperty>
        <owl:someValuesFrom>
            <owl:Class rdf:about="#X" /> 
        </owl:someValuesFrom>
        <rdfs:subClassOf rdf:resource="#Y" />
    </owl:Restriction>

</rdf:RDF>