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我有一些有实例的猫头鹰类。这些类还具有对每个实例都有价值的属性。我已经通过 Protege3.4 制作了我的本体，并通过 Rowlex 从他们那里制作了 c# 库。
例如，“程序”类具有“软件”和“atGrade”属性的实例。此实例的属性值为“PHD”（atGrade 是将域映射到 Grade 类的对象属性）。这是猫头鹰：

<owl:Class rdf:about="http://www.owl-ontologies.com/Ontology1243411901.owl#Program">
    <rdfs:subClassOf rdf:resource="http://www.w3.org/2002/07/owl#Thing"/>
    <owl:disjointWith rdf:resource="http://www.owl-ontologies.com/Ontology1243411901.owl#Student"/>
    <owl:disjointWith rdf:resource="http://www.owl-ontologies.com/Ontology1243411901.owl#Teacher"/>
    <owl:disjointWith rdf:resource="http://www.owl-ontologies.com/Ontology1243411901.owl#Rank"/>
    <rdfs:subClassOf>
        <owl:Restriction>
            <owl:onProperty>
                <owl:ObjectProperty rdf:about="http://www.owl-ontologies.com/Ontology1243411901.owl#atGrade"/>
            </owl:onProperty>
            <owl:allValuesFrom rdf:resource="http://www.owl-ontologies.com/Ontology1243411901.owl#Grade"/>
        </owl:Restriction>
    </rdfs:subClassOf>
    <owl:disjointWith rdf:resource="http://www.owl-ontologies.com/Ontology1243411901.owl#Course"/>
    <owl:disjointWith>
        <owl:Class rdf:about="http://www.owl-ontologies.com/Ontology1243411901.owl#LearningResource"/>
    </owl:disjointWith>
    <owl:disjointWith rdf:resource="http://www.owl-ontologies.com/Ontology1243411901.owl#Note"/>
    <owl:disjointWith rdf:resource="http://www.owl-ontologies.com/Ontology1243411901.owl#ClassOfCourse"/>
    <owl:equivalentClass>
        <owl:Class>
            <owl:oneOf rdf:parseType="Collection">
                <Program rdf:about="http://www.owl-ontologies.com/Ontology1243411901.owl#Management">
                    <atGrade rdf:resource="http://www.owl-ontologies.com/Ontology1243411901.owl#PHD"/>
                </Program>
                <Program rdf:about="http://www.owl-ontologies.com/Ontology1243411901.owl#Literature">
                    <atGrade rdf:resource="http://www.owl-ontologies.com/Ontology1243411901.owl#PHD"/>
                </Program>
                <Program rdf:about="http://www.owl-ontologies.com/Ontology1243411901.owl#Software">
                    <atGrade rdf:resource="http://www.owl-ontologies.com/Ontology1243411901.owl#MasterOfResearch"/>
                </Program>
                <Program rdf:about="http://www.owl-ontologies.com/Ontology1243411901.owl#Information_Technology">
                    <atGrade rdf:resource="http://www.owl-ontologies.com/Ontology1243411901.owl#MasterOfScience"/>
                </Program>
            </owl:oneOf>
        </owl:Class>
    </owl:equivalentClass>
    <owl:disjointWith>
        <owl:Class rdf:about="http://www.owl-ontologies.com/Ontology1243411901.owl#Project"/>
    </owl:disjointWith>
    <owl:disjointWith rdf:resource="http://www.owl-ontologies.com/Ontology1243411901.owl#Grade"/>
    <owl:disjointWith rdf:resource="http://www.owl-ontologies.com/Ontology1243411901.owl#ResourceType"/>
    <owl:disjointWith rdf:resource="http://www.owl-ontologies.com/Ontology1243411901.owl#Language"/>
    <rdfs:comment xml:lang="en">Study branch in which the members are working (e.g. MBA)</rdfs:comment>
    <owl:disjointWith>
        <owl:Class rdf:about="http://www.owl-ontologies.com/Ontology1243411901.owl#Discussion"/>
    </owl:disjointWith>
    <owl:disjointWith rdf:resource="http://www.owl-ontologies.com/Ontology1243411901.owl#Question"/>
</owl:Class>

atGrade 属性也在本体中定义：

<owl:ObjectProperty rdf:about="http://www.owl-ontologies.com/Ontology1243411901.owl#atGrade">
    <rdfs:range rdf:resource="http://www.owl-ontologies.com/Ontology1243411901.owl#Grade"/>
    <rdfs:domain>
        <owl:Class>
            <owl:unionOf rdf:parseType="Collection">
                <owl:Class rdf:about="http://www.owl-ontologies.com/Ontology1243411901.owl#Program"/>
                <owl:Class rdf:about="http://www.owl-ontologies.com/Ontology1243411901.owl#Teacher"/>
                <owl:Class rdf:about="http://www.owl-ontologies.com/Ontology1243411901.owl#Project"/>
                <owl:Class rdf:about="http://www.owl-ontologies.com/Ontology1243411901.owl#Course"/>
                <owl:Class rdf:about="http://www.owl-ontologies.com/Ontology1243411901.owl#Student"/>
            </owl:unionOf>
        </owl:Class>
    </rdfs:domain>
</owl:ObjectProperty>

现在，当我在 c# 中创建一个实例时，例如：

Program prog = new Program("http://www.owl-ontologies.com/Ontology1243411901.owl#Management", new RdfDocument());

atGrade 属性返回 null。我做了以下操作，但问题没有解决： -
制作了一个完整的课程（新程序_（...））
- 输入了现有的 RDF 文件：新程序（uri，new RdfDocument（uri））。
-从本体中删除了“rdfs:subClassOf”标签。

有什么想法可以解决这个问题吗？
也许我应该从本体中删除实例并将它们插入 RDF，然后从那里检索它们？

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1 回答 1

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你在你的本体中规定了哪些人遵守你的程序类。如果一个人的 URI 是您列举的其中一个并且具有适当的 atGrade 属性，则该个人是“程序”。

当您创建 RdfDocument 并创建一个新的 Program 实例时，您将得到的只是一个三元组，如“myUri typeof Program”。ROWLEX 不会按照您的预期填写默认值并添加额外的 atGrade 属性。这就是为什么在检索属性时会得到 null 的原因。您需要将 atGrade 属性添加到个人，否则它甚至不是有效的 Program 实例。

于 2009-08-07T09:21:40.997 回答