Question

我想使用sparql端点链接两个不同的数据集（比如说http://dbpedia.org/sparql和http://pubmed.bio2rdf.org/sparql）我将从头开始创建一个OWL本体，然后用这两个来填充这个本体不同的数据集。

我是语义网和链接数据概念的新手。如果你们给我一些关于开始这件事的例子/想法吗？

Answer 1

您是否希望使用SPARQL一次进行两个本体查询？如果那时它很容易做到。取两个Ontologies（.OWL文件）并使用SPARQL（jena-fuseki服务器）查询两个OWL文件的PREFIX。

你能详细说明这个问题吗？您想要端点上的OWL文件或SPARQL查询示例吗？

Answer 2

SPARQL提示在网上很难找到。使用下面的示例，您可以填充您的本体。我在回答自己的问题时感到有些孤独。

使用pubmed sparql端点，我使用了项目gutenberg端点。首先，我使用Protegé创建了一个本体。这非常简单直接。 Followinh是Kafka和Twain的作品在DBPedia和Project Gutenberg上的元数据的示例查询。

PREFIX gb: <yourOntologyGoesHere.owl#>
  PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
  PREFIX foaf: <http://xmlns.com/foaf/0.1/>
  PREFIX dbpedia-owl: <http://dbpedia.org/ontology/>
  PREFIX dbpprop: <http://dbpedia.org/property/>
  PREFIX dc:<http://purl.org/dc/elements/1.1/>
  PREFIX foaf:<http://xmlns.com/foaf/0.1/>
  PREFIX dcterms: <http://purl.org/dc/terms/>
  CONSTRUCT {
  ?book rdf:type gb:Book .
  ?book gb:titled_as ?name.
  gb:Title rdf:type ?name.
  ?book gb:written_by ?author.
  ?author rdf:type gb:Author.
  ?book gb:author_name ?authorName.
  gb:Author rdf:type ?authorName.
  gb:AuthorName rdf:type ?authorName.
  ?book gb:released ?firstPublished.
  ?firstPublished rdf:type gb:PublishDate.
  ?book gb:writtenInCountry ?country .
  ?country rdf:type gb:Country.
  ?book gb:writtenIn ?lang .
  ?lang rdf:type gb:Language.
  ?book gb:summary ?abstract.
  gb:Absratct rdf:type ?abstract.
  ?book gb:identified_with ?isbn .
  gb:ISBN rdf:type ?isbn.
  ?book gb:publish_tpe ?mediaType .
  ?mediaType rdf:type gb:Media .
  ?book gb:has_pagenumber ?pages.
  gb:Pages rdf:type ?pages.
  ?book gb:genre ?genre
  }WHERE{?book rdf:type dbpedia-owl:Book .
   ?book foaf:name ?name.
   OPTIONAL {?book dbpedia-owl:author ?author}
   OPTIONAL {?author dbpprop:name ?authorName}
   OPTIONAL {?book dbpedia-owl:releaseDate ?firstPublished}
   OPTIONAL {?book dbpedia-owl:country ?country}
   OPTIONAL {?book dbpedia-owl:language ?lang}
   OPTIONAL {?book dbpedia-owl:abstract ?abstract}
   OPTIONAL {?book dbpedia-owl:isbn ?isbn}
   OPTIONAL {?book dbpedia-owl:numberOfPages ?pages}
   OPTIONAL {?book dbpedia-owl:mediaType ?mediaType}
   OPTIONAL {?book dbpprop:genre ?genre}
   FILTER ( regex(str(?author), "Franz_Kafka") || regex(str(?author), "Mark_Twain") )
   FILTER (LANG(?abstract)="en")
  }

DBpedia中

PREFIX gb: <yourOntologyGoesHere.owl#>
  PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>        
  PREFIX movie: <http://data.linkedmdb.org/resource/movie/>
  PREFIX rdfs:<http://www.w3.org/2000/01/rdf-schema#>
  PREFIX dc: <http://purl.org/dc/terms/>
  prefix owl: <http://www.w3.org/2002/07/owl#>
  PREFIX dc:<http://purl.org/dc/elements/1.1/>
  PREFIX foaf:<http://xmlns.com/foaf/0.1/>
  PREFIX dcterms: <http://purl.org/dc/terms/>

  CONSTRUCT {
  ?book rdf:type gb:Book .
  ?book gb:title ?bookTitle .
  ?book gb:written_by ?author.
  ?author rdf:type gb:Author.
  ?book gb:addedToGutenberg ?addedToCatalog.
  ?addedToCatalog rdf:type gb:AddedToGutenberg.
  ?book1 rdf:type gb:Book .
  ?book1 gb:title ?bookTitle1 .
  ?book1 gb:written_by ?author1.
  ?author1 rdf:type gb:Author.
  ?author owl:sameAs <http://dbpedia.org/resource/Franz_Kafka> .
  ?author1 owl:sameAs <http://dbpedia.org/resource/Mark_Twain> .
  <http://wifo5-04.informatik.uni-mannheim.de/gutendata/resource/etext3176> owl:sameAs <http://dbpedia.org/resource/The_Innocents_Abroad>.
  <http://wifo5-04.informatik.uni-mannheim.de/gutendata/resource/etext3177> owl:sameAs <http://dbpedia.org/resource/Roughing_It>.
  <http://wifo5-04.informatik.uni-mannheim.de/gutendata/resource/etext245> owl:sameAs <http://dbpedia.org/resource/Life_on_the_Mississippi>.
  <http://wifo5-04.informatik.uni-mannheim.de/gutendata/resource/etext9009> owl:sameAs <http://dbpedia.org/resource/Life_on_the_Mississippi>.
  <http://wifo5-04.informatik.uni-mannheim.de/gutendata/resource/etext1086> owl:sameAs <http://dbpedia.org/resource/A_Horse's_Tale>.
  <http://wifo5-04.informatik.uni-mannheim.de/gutendata/resource/etext119> owl:sameAs <http://dbpedia.org/resource/A_Tramp_Abroad>.
  <http://wifo5-04.informatik.uni-mannheim.de/gutendata/resource/etext3174> owl:sameAs <http://dbpedia.org/resource/A_Dog's_Tale>.
  <http://wifo5-04.informatik.uni-mannheim.de/gutendata/resource/etext3186> owl:sameAs <http://dbpedia.org/resource/The_Mysterious_Stranger>.
  <http://wifo5-04.informatik.uni-mannheim.de/gutendata/resource/etext3190> owl:sameAs <http://dbpedia.org/resource/1610_(Mark_Twain)>.
  <http://wifo5-04.informatik.uni-mannheim.de/gutendata/resource/etext3251> owl:sameAs <http://dbpedia.org/resource/The_Man_That_Corrupted_Hadleyburg>.
  <http://wifo5-04.informatik.uni-mannheim.de/gutendata/resource/etext91> owl:sameAs <http://dbpedia.org/resource/Tom_Sawyer_Abroad>.
  <http://wifo5-04.informatik.uni-mannheim.de/gutendata/resource/etext93> owl:sameAs <http://dbpedia.org/resource/Tom_Sawyer,_Detective>.
  <http://dbpedia.org/resource/The_Metamorphosis> owl:sameAs <http://wifo5-04.informatik.uni-mannheim.de/gutendata/resource/etext5200> .
  <http://wifo5-04.informatik.uni-mannheim.de/gutendata/resource/etext7849> owl:sameAs <http://dbpedia.org/resource/The_Trial>.
  ?book1 gb:addedToGutenberg ?addedToCatalog1.
  ?addedToCatalog1 rdf:type gb:AddedToGutenberg
  }
  WHERE {
  ?author foaf:name "Kafka, Franz, 1883-1924".
  ?author1 foaf:name "Twain, Mark, 1835-1910".
  ?book dc:creator ?author;
  dc:title ?bookTitle;
  dc:language ?bookLanguage;
  dcterms:created ?addedToCatalog.
  ?book1 dc:creator ?author1;
  dc:title ?bookTitle1;
  dc:language ?bookLanguage1;
  dcterms:created ?addedToCatalog1}

这两个查询将填充您创建的本体。然后，您可以查询新创建的本体。

Answer 3

使用SPARQL SERVICE，您可以执行以下操作：

CONSTRUCT {
   <dbpedia-value1> a <your-class1> .
   <dbpedia-value1> ?p1 ?o1 .
   <pubmed-value2> a <your-class2> . #or perhaps also <your-class1>
   <pubmed-value2> ?p2 ?o2 .
}
WHERE {
   SERVICE <http://dbpedia.org/sparql> {
      <dbpedia-value1> a <dbp-class1> .
      <dbpedia-value1> ?p1 ?o1 .
   }
   SERVICE <http://pubmed.bio2rdf.org/sparql> {
      <pubmed-value2> a <pubmed-class1> .
      <pubmed-value2> ?p2 ?o2 .
   }
}

这将从每个端点中的类获取一组实例，并将它们映射到您的本体。对端点的查询可以是任意复杂的（SPARQL IN在这里可能很有用），但一般的技术是查询该数据并使用CONSTRUCT将这些值映射到本体中的三元组，然后保存构造的三元组。（或直接将数据插入图表。）

您还可以使用此模式映射源和本体之间的属性。在这种情况下，请在WHERE子句中指定特定属性

<pubmed-value2> <pubmed-prop1> ?prop1value .

...然后在CONSTRUCT查询中转换它们：

<pubmed-value2> <your-prop1> ?prop1value .

从外部SPARQL端点填充OWL本体

3 个答案: