我跑下面的查询，并得到了电影，并从他们相应的URI DBpedia的数据linkedmdb 。
SELECT ?film ?label ?dbpediaLink
WHERE {
?film rdf:type movie:film .
?film rdfs:label ?label .
?film owl:sameAs ?dbpediaLink
FILTER(regex(str(?dbpediaLink), "dbpedia", "i"))
}
LIMIT 100
我想使用从DBpedia中这些电影的范畴?dbpediaLink URI。 另外，我需要得到的值dcterms:subject属性为电影从DBpedia中。 我无法理解如何将它们连接？ 我可以通过SPARQL做，或做我需要编写代码呢？
你想要一个联合SPARQL查询 。 你不需要写代码（除SPARQL查询等）。 你需要一个支持它们的端点，并且因为它需要查询多个端点，您可能需要运行自己的端点（即可能不包含任何实际的数据，但可以为你做的联邦）。 根据您上述要求，你可能要像下面的查询。 请注意，我删除?dbpediaLink从预计的变量; 也就是说，该查询不SELECT ?dbpediaLink ，因为你可能不希望看到该值这么多，因为用它来检索数据DBpedia中。 如果你想要的话，当然你也可以添加回来。
PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX movie: <http://data.linkedmdb.org/resource/movie/>
PREFIX dcterms: <http://purl.org/dc/terms/>
SELECT ?film ?label ?subject WHERE {
SERVICE <http://data.linkedmdb.org/sparql> {
?film a movie:film .
?film rdfs:label ?label .
?film owl:sameAs ?dbpediaLink
FILTER(regex(str(?dbpediaLink), "dbpedia", "i"))
}
SERVICE <http://dbpedia.org/sparql> {
?dbpediaLink dcterms:subject ?subject
}
}
LIMIT 50
您无法对直接运行DBpedia的SPARQL端点 ，但您可以使用耶拿的ARQ在本地运行查询，ARQ会做查询到其他端点为您服务。 我创建一个空文件， data.n3传递给ARQ作为--query参数，并能够运行查询所示（这里query.sparql是上面的查询）：
$ arq --query query.sparql --data data.n3
结果如下所示。 请注意，每个DBpedia中的资源可以与多个类别由dcterms:subject属性，所以即使我们有一个LIMIT 50在那里，我们没有实际得到50部电影，但50个结果行。
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| film | label | subject |
================================================================================================================================================================================
| <http://data.linkedmdb.org/resource/film/11> | "Godzilla vs. the Sea Monster" | <http://dbpedia.org/resource/Category:1960s_horror_films> |
| <http://data.linkedmdb.org/resource/film/11> | "Godzilla vs. the Sea Monster" | <http://dbpedia.org/resource/Category:Films_directed_by_Jun_Fukuda> |
| <http://data.linkedmdb.org/resource/film/11> | "Godzilla vs. the Sea Monster" | <http://dbpedia.org/resource/Category:Giant_monster_films> |
| <http://data.linkedmdb.org/resource/film/11> | "Godzilla vs. the Sea Monster" | <http://dbpedia.org/resource/Category:Monster_movies> |
| <http://data.linkedmdb.org/resource/film/11> | "Godzilla vs. the Sea Monster" | <http://dbpedia.org/resource/Category:1966_films> |
| <http://data.linkedmdb.org/resource/film/11> | "Godzilla vs. the Sea Monster" | <http://dbpedia.org/resource/Category:Godzilla_films> |
| <http://data.linkedmdb.org/resource/film/11> | "Godzilla vs. the Sea Monster" | <http://dbpedia.org/resource/Category:Japanese_films> |
| <http://data.linkedmdb.org/resource/film/11> | "Godzilla vs. the Sea Monster" | <http://dbpedia.org/resource/Category:Kaiju_films> |
| <http://data.linkedmdb.org/resource/film/11> | "Godzilla vs. the Sea Monster" | <http://dbpedia.org/resource/Category:Mothra> |
| <http://data.linkedmdb.org/resource/film/11> | "Godzilla vs. the Sea Monster" | <http://dbpedia.org/resource/Category:Terrorism_in_fiction> |
| <http://data.linkedmdb.org/resource/film/11> | "Godzilla vs. the Sea Monster" | <http://dbpedia.org/resource/Category:1960s_science_fiction_films> |
| <http://data.linkedmdb.org/resource/film/11> | "Godzilla vs. the Sea Monster" | <http://dbpedia.org/resource/Category:Sequel_films> |
| <http://data.linkedmdb.org/resource/film/11> | "Godzilla vs. the Sea Monster" | <http://dbpedia.org/resource/Category:Japanese-language_films> |
| <http://data.linkedmdb.org/resource/film/11> | "Godzilla vs. the Sea Monster" | <http://dbpedia.org/resource/Category:Mystery_Science_Theater_3000_episodes> |
| <http://data.linkedmdb.org/resource/film/105> | "Top Hat" | <http://dbpedia.org/resource/Category:1930s_musical_films> |
| <http://data.linkedmdb.org/resource/film/105> | "Top Hat" | <http://dbpedia.org/resource/Category:American_musical_comedy_films> |
| <http://data.linkedmdb.org/resource/film/105> | "Top Hat" | <http://dbpedia.org/resource/Category:American_romantic_comedy_films> |
| <http://data.linkedmdb.org/resource/film/105> | "Top Hat" | <http://dbpedia.org/resource/Category:American_romantic_musical_films> |
| <http://data.linkedmdb.org/resource/film/105> | "Top Hat" | <http://dbpedia.org/resource/Category:1935_films> |
| <http://data.linkedmdb.org/resource/film/105> | "Top Hat" | <http://dbpedia.org/resource/Category:American_screwball_comedy_films> |
| <http://data.linkedmdb.org/resource/film/105> | "Top Hat" | <http://dbpedia.org/resource/Category:Black-and-white_films> |
| <http://data.linkedmdb.org/resource/film/105> | "Top Hat" | <http://dbpedia.org/resource/Category:Films_directed_by_Mark_Sandrich> |
| <http://data.linkedmdb.org/resource/film/105> | "Top Hat" | <http://dbpedia.org/resource/Category:1930s_romantic_comedy_films> |
| <http://data.linkedmdb.org/resource/film/105> | "Top Hat" | <http://dbpedia.org/resource/Category:United_States_National_Film_Registry_films> |
| <http://data.linkedmdb.org/resource/film/105> | "Top Hat" | <http://dbpedia.org/resource/Category:Films_set_in_London> |
| <http://data.linkedmdb.org/resource/film/105> | "Top Hat" | <http://dbpedia.org/resource/Category:RKO_Pictures_films> |
| <http://data.linkedmdb.org/resource/film/154> | "E.T. the Extra-Terrestrial" | <http://dbpedia.org/resource/Category:American_children's_fantasy_films> |
| <http://data.linkedmdb.org/resource/film/154> | "E.T. the Extra-Terrestrial" | <http://dbpedia.org/resource/Category:Best_Original_Music_Score_Academy_Award_winners> |
| <http://data.linkedmdb.org/resource/film/154> | "E.T. the Extra-Terrestrial" | <http://dbpedia.org/resource/Category:E.T._the_Extra-Terrestrial> |
| <http://data.linkedmdb.org/resource/film/154> | "E.T. the Extra-Terrestrial" | <http://dbpedia.org/resource/Category:English-language_films> |
| <http://data.linkedmdb.org/resource/film/154> | "E.T. the Extra-Terrestrial" | <http://dbpedia.org/resource/Category:1980s_science_fiction_films> |
| <http://data.linkedmdb.org/resource/film/154> | "E.T. the Extra-Terrestrial" | <http://dbpedia.org/resource/Category:1982_films> |
| <http://data.linkedmdb.org/resource/film/154> | "E.T. the Extra-Terrestrial" | <http://dbpedia.org/resource/Category:Alien_visitation_films> |
| <http://data.linkedmdb.org/resource/film/154> | "E.T. the Extra-Terrestrial" | <http://dbpedia.org/resource/Category:Amblin_Entertainment_films> |
| <http://data.linkedmdb.org/resource/film/154> | "E.T. the Extra-Terrestrial" | <http://dbpedia.org/resource/Category:Films_directed_by_Steven_Spielberg> |
| <http://data.linkedmdb.org/resource/film/154> | "E.T. the Extra-Terrestrial" | <http://dbpedia.org/resource/Category:1985_novels> |
| <http://data.linkedmdb.org/resource/film/154> | "E.T. the Extra-Terrestrial" | <http://dbpedia.org/resource/Category:American_science_fiction_films> |
| <http://data.linkedmdb.org/resource/film/154> | "E.T. the Extra-Terrestrial" | <http://dbpedia.org/resource/Category:Films_produced_by_Steven_Spielberg> |
| <http://data.linkedmdb.org/resource/film/154> | "E.T. the Extra-Terrestrial" | <http://dbpedia.org/resource/Category:Films_set_in_the_San_Fernando_Valley> |
| <http://data.linkedmdb.org/resource/film/154> | "E.T. the Extra-Terrestrial" | <http://dbpedia.org/resource/Category:Films_that_won_the_Best_Sound_Mixing_Academy_Award> |
| <http://data.linkedmdb.org/resource/film/154> | "E.T. the Extra-Terrestrial" | <http://dbpedia.org/resource/Category:United_States_National_Film_Registry_films> |
| <http://data.linkedmdb.org/resource/film/154> | "E.T. the Extra-Terrestrial" | <http://dbpedia.org/resource/Category:Universal_Pictures_films> |
| <http://data.linkedmdb.org/resource/film/154> | "E.T. the Extra-Terrestrial" | <http://dbpedia.org/resource/Category:Best_Drama_Picture_Golden_Globe_winners> |
| <http://data.linkedmdb.org/resource/film/154> | "E.T. the Extra-Terrestrial" | <http://dbpedia.org/resource/Category:Films_that_won_the_Best_Visual_Effects_Academy_Award> |
| <http://data.linkedmdb.org/resource/film/155> | "Easy Rider" | <http://dbpedia.org/resource/Category:1960s_drama_films> |
| <http://data.linkedmdb.org/resource/film/155> | "Easy Rider" | <http://dbpedia.org/resource/Category:American_films> |
| <http://data.linkedmdb.org/resource/film/155> | "Easy Rider" | <http://dbpedia.org/resource/Category:1969_films> |
| <http://data.linkedmdb.org/resource/film/155> | "Easy Rider" | <http://dbpedia.org/resource/Category:Films_shot_in_New_Orleans,_Louisiana> |
| <http://data.linkedmdb.org/resource/film/155> | "Easy Rider" | <http://dbpedia.org/resource/Category:Directorial_debut_films> |
| <http://data.linkedmdb.org/resource/film/155> | "Easy Rider" | <http://dbpedia.org/resource/Category:Films_about_drugs> |
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