您需要询问属于Tag子类的事物.因此，类似

You need to ask for things that are subclasses of Tag. Thus, something like

?class rdfs:subClassOf* :Tag

*表示您需要匹配0次或更多次出现的rdfs:subClassOf的路径，因此?class可以是Tag或Tag的子类，或Tag的子类的子类，等等.完整的工作查询将是:

The * means you need to match a path of 0 or more occurrences of rdfs:subClassOf, so ?class can be Tag, or a subclass of Tag, or or subclass of a subclass of Tag, etc. A complete working query would be:

prefix :      <http://www.semanticweb.org/man/ontologies/2014/5/untitled-ontology-11#> 
prefix owl:   <http://www.w3.org/2002/07/owl#> 
prefix rdfs:  <http://www.w3.org/2000/01/rdf-schema#> 

select distinct ?subject where {
   ?subject owl:equivalentClass ?restriction .
   ?restriction owl:onProperty :hasTags .
   ?restriction ?restrictType ?class .
   ?class rdfs:subClassOf* :Tag 
}

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| subject                                                                                 |
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| :Java_programming                                                                       |
| <http://www.semanticweb.org/man/ontologies/2014/5/untitled-ontology-11#C++_programming> |
| :System_Programming                                                                     |
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