<rdfs:label xml:lang="en">Father</rdfs:label>

    <rdfs:subClassOf rdf:resource="#Person"/>

    <rdfs:subClassOf>

      <owl:Restriction>
        <owl:onProperty>

          <owl:DatatypeProperty rdf:ID="hasAge"/>

        </owl:onProperty>

        <owl:minCardinality rdf:datatype="http://www.w3.org/2001/XMLSchema#int">50</owl:minCardinality>

/*
觉得上面这样做不对，这只能说明hasAage属性至少有50个int型实例，不知道我的观点是不是正确。要怎么样才能表示年龄>50呢？
*/

      </owl:Restriction>

    </rdfs:subClassOf>

  </owl:Class>
…………………………

  <owl:DatatypeProperty rdf:about="#hasAge">

    <rdfs:range rdf:resource="http://www.w3.org/2001/XMLSchema#int"/>

    <rdfs:domain rdf:resource="#Father"/>

  </owl:DatatypeProperty>

即便如此，使用race 检验一致性是出现warning：
Not able to convert datatype property cardinality restrictins
to DIG(the lanuage used to communicate with the reasoner).
ignoring this restriction and attempting to continue.