OWL - 结合unionOf和allValuesFrom

Question

如下所示编写owl:unionOf是否正确：

<owl:Class rdf:ID="Camera">
      <owl:unionOf rdf:parseType="Collections">
        <owl:Class>
          <rdfs:subClassOf>
            <owl:Restriction>
              <owl>onProperty rdf:resource="#hasType"/>
              <owl:allValuesFrom rdf:resource="#Digital"/>
            </owl:Restriction>
          </rdfs:subClassOf>
        </owl:Class>
        <owl:Class>
          <rdfs:subClassOf>
            <owl:Restriction>
              <owl>onProperty rdf:resource="#hasType"/>
              <owl:allValuesFrom rdf:resource="#Film"/>
            </owl:Restriction>
          </rdfs:subClassOf>
        </owl:Class>
      </owl:unionOf>
</owl:Class>

还有其他方法可以指定 hasType 属性的值应为 数字 或 胶片