使用 SPARQL 从 DBpedia 获取所有国家名称

Get all Countries Name from DBpedia using SPARQL

我想要来自 DBpedia 的国家名称列表。

我正在使用 http://dbpedia.org/snorql/ 来执行我的查询,但直到现在我还没有找到 DBpedia 中可用的所有国家名称。

例如:dbr:United_Kingdom, dbr:India, dbr:United_States,等等

是问题

  1. 你不知道SPARQL一般怎么写? (没关系,很难上手。)
  2. 您不知道 DBpedia 中的 classes 和谓词? (那也行,我每次都要检查一下。)
  3. 还有别的吗?

这得到了所有联合国成员国。获得 "all countries" 可能只是在他们的 ontology.

中找到正确的 class 的问题
select distinct ?s
where { ?s a <http://dbpedia.org/class/yago/WikicatMemberStatesOfTheUnitedNations> }

我碰巧知道纽约市是美国最大的城市,而 DBpedia 有一个 largestCity 谓词和一个 New_York_City 实例。所以我写了一个应该只获取 United States 作为主语的查询,然后询问所有连接的谓语和宾语。您应该在其中查找满足定义 "all countries." 异常的对象,如果找不到,您可能必须 union 将其他一些三重模式放入一个查询中。

我还过滤掉了包含与您相关的两个术语之一的对象:"country" 或 "nation"

select distinct *
where { ?s a <http://dbpedia.org/class/yago/WikicatMemberStatesOfTheUnitedNations> ;
dbo:largestCity  dbr:New_York_City ;
?p ?o
filter(isURI(?o))
filter((regex(lcase(str(?o)), "country")) || (regex(lcase(str(?o)), "nation")))

}

提供以下内容,这应该可以帮助您编写一个不针对美国的后续问题。

+--------------------------------------------+---------------------------------------------------+------------------------------------------------------------------------------+
|                     s                      |                        p                          |                                      o                                       |
+--------------------------------------------+---------------------------------------------------+------------------------------------------------------------------------------+
| http://dbpedia.org/resource/United_States  | http://dbpedia.org/ontology/wikiPageExternalLink  | http://www.ifs.du.edu/ifs/frm_CountryProfile.aspx?Country=US                 |
| http://dbpedia.org/resource/United_States  | http://dbpedia.org/ontology/wikiPageExternalLink  | http://nationalatlas.gov/                                                    |
| http://dbpedia.org/resource/United_States  | http://www.w3.org/1999/02/22-rdf-syntax-ns#type   | http://dbpedia.org/class/yago/Country108544813                               |
| http://dbpedia.org/resource/United_States  | http://purl.org/dc/terms/subject                  | http://dbpedia.org/resource/Category:G7_nations                              |
| http://dbpedia.org/resource/United_States  | http://www.w3.org/1999/02/22-rdf-syntax-ns#type   | http://schema.org/Country                                                    |
| http://dbpedia.org/resource/United_States  | http://www.w3.org/2000/01/rdf-schema#seeAlso      | http://dbpedia.org/resource/Anti-miscegenation_laws                          |
| http://dbpedia.org/resource/United_States  | http://purl.org/dc/terms/subject                  | http://dbpedia.org/resource/Category:Member_states_of_the_United_Nations     |
| http://dbpedia.org/resource/United_States  | http://www.w3.org/2002/07/owl#sameAs              | http://transparency.270a.info/classification/country/US                      |
| http://dbpedia.org/resource/United_States  | http://www.w3.org/1999/02/22-rdf-syntax-ns#type   | http://dbpedia.org/ontology/Country                                          |
| http://dbpedia.org/resource/United_States  | http://www.w3.org/1999/02/22-rdf-syntax-ns#type   | http://dbpedia.org/class/yago/WikicatMemberStatesOfTheUnitedNations          |
| http://dbpedia.org/resource/United_States  | http://purl.org/dc/terms/subject                  | http://dbpedia.org/resource/Category:G8_nations                              |
| http://dbpedia.org/resource/United_States  | http://www.w3.org/2002/07/owl#sameAs              | http://linked-web-apis.fit.cvut.cz/resource/united_states_of_america_country |
| http://dbpedia.org/resource/United_States  | http://dbpedia.org/ontology/wikiPageExternalLink  | http://www.nationalcenter.org/HistoricalDocuments.html                       |
| http://dbpedia.org/resource/United_States  | http://dbpedia.org/ontology/wikiPageExternalLink  | http://news.bbc.co.uk/2/hi/americas/country_profiles/1217752.stm             |
| http://dbpedia.org/resource/United_States  | http://www.w3.org/1999/02/22-rdf-syntax-ns#type   | http://umbel.org/umbel/rc/Country                                            |
| http://dbpedia.org/resource/United_States  | http://purl.org/dc/terms/subject                  | http://dbpedia.org/resource/Category:G20_nations                             |
+--------------------------------------------+---------------------------------------------------+------------------------------------------------------------------------------+