RDF架构-如何创建实例? [英] RDF Schema - how to create instances?

问题描述

我想在RDFS文件中有类的实例，但是我不知道该怎么做.

I want to have instances of classes in my RDFS file, but I don't know how to do it.

我的课:

<rdfs:Class rdf:ID="Turns">
   <rdfs:range rdf:resource="Literal"/>
</rdfs:Class>

我的财产:

<rdf:Property rdf:ID="has_Turns">
   <rdfs:domain rdf:resource="#Device"/>
   <rdfs:range rdf:resource="#Turns_Frequency"/>
</rdf:Property>

我想获得带有"has_Turns"属性的"Turns"类的实例. 我尝试过这样的事情:

I want to get an instance of class "Turns" with a "has_Turns" property. I tried something like this:

<Turns_Instance rdf:ID="Turns">…</Turns_Instance>

…但是主类是"Turns_Instance"，反之则不起作用.更何况我不知道将财产放在何处.所有实例都应位于RDFS文件中.

… but it takes that the main class is "Turns_Instance", the other way round it doesn't work. What's more I don't know where to put the property. All instances should be in RDFS file.

推荐答案

实例可以在类定义中定义为:

The instance can be defined within the class definition as:

<ex:Turns rdf:about="http://example.org/ex1#Turns_Instance">
   <ex:hasTurns>
      <ex:Turns_Frequency rdf:about="http://example.org/ex1#Turns_Frequency_Instance"/>
   </ex:hasTurns>
</ex:Turns>

还请注意，范围定义属于属性定义，而不是类定义.因此，真正的错误可能是使用RDF/XML文本序列化.任何RDF编辑器都应该能够使用和生成Turtle，这是人类可读的.在这种情况下，类和实例的定义如下所示:

Note also that range definitions belong on property definitions, not class definitions. So the the real bug may be using the RDF/XML text serialization. Any RDF editor should be able to consume and generate Turtle, which is human readable. In that case the class and instance definition look like the following:

@prefix ex: <http://example.org/ex1#> .

ex:Turns
  rdf:type owl:Class .
ex:Turns_Instance
  rdf:type ex:Turns ;
  ex:hasTurns ex:Turns_Frequency_instance .
ex:Device
  rdf:type owl:Class .
ex:Turns_Frequency
  rdf:type owl:Class .
ex:hasTurns
  rdf:type owl:ObjectProperty ;
  rdfs:domain ex:Turns ;
  rdfs:range ex:Turns_Frequency .

除了能够轻松地看到"三元组之外，RDF作为对象表示形式也变得更加清晰，这对于理解RDF的工作原理是一个巨大的优势.

In addition to being able to easily "see" the triples, RDF as an object representation become much clearer, which is a huge advantage for understanding how RDF works.

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