使用SPARQL从DBpedia获取所有国家的名称

我想要DBpedia中的国家名称列表

我正在使用来执行我的查询，但到目前为止，我还没有找到DBpedia中所有可用的国家名称

例如：dbr:，dbr:，dbr:，等等。

是问题所在

一般来说，您不知道如何编写SPARQL？（没关系，很难开始。）

你不知道DBpedia中的类和谓词吗？（也没关系，我每次都要检查。）

还有别的吗

这得到了所有联合国会员国的支持。获得“所有国家”可能只是在它们的本体中找到正确的类的问题

select distinct ?s
where { ?s a <http://dbpedia.org/class/yago/WikicatMemberStatesOfTheUnitedNations> }

提供以下信息，这将有助于你写出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                             |
+--------------------------------------------+---------------------------------------------------+------------------------------------------------------------------------------+

---

好的，向我们展示您迄今为止编写的SPARQL，即使它没有得到“所有国家”。我的SPARQL查询是

SELECT DISTINCT？country WHERE{？city rdf:type dbo:city；rdfs:label？label；dbo:country？country}order by？country

，或者您可以打开它，您并不是在要求所有国家。您要求的是所有与某个国家有已知关系的城市。这听起来可能有点学术性，但DBpedia中可能有一些国家没有记录在案的城市。您是否尝试了我在下面提供的查询？使用我指出的一些类进行查询，然后

减去
从基于城市的问题中找出可用的国家，这可能会很有趣。
+--------------------------------------------+---------------------------------------------------+------------------------------------------------------------------------------+
|                     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                             |
+--------------------------------------------+---------------------------------------------------+------------------------------------------------------------------------------+