{"id":23,"date":"2018-12-13T22:35:41","date_gmt":"2018-12-13T20:35:41","guid":{"rendered":"http:\/\/ma-graph.org\/?page_id=23"},"modified":"2025-06-20T19:17:13","modified_gmt":"2025-06-20T18:17:13","slug":"sparql-endpoint","status":"publish","type":"page","link":"https:\/\/semrepo.org\/index.php\/sparql-endpoint\/","title":{"rendered":"SPARQL"},"content":{"rendered":"\n

The public SPARQL endpoint of the SemRepo Knowledge Graph is provided at https:\/\/semrepo.org\/sparql<\/a><\/strong><\/p>\n\n\n\n

Example (Federated) SPARQL queries:<\/strong><\/p>\n\n\n\n

Programming Languages Used for each topic<\/mark><\/em><\/p>\n\n\n\n

PREFIX rdf: <http:\/\/www.w3.org\/1999\/02\/22-rdf-syntax-ns#>\nPREFIX foaf: <http:\/\/xmlns.com\/foaf\/0.1\/>\nPREFIX sr: <https:\/\/semrepo.org\/property\/>\nPREFIX srclass: <https:\/\/semrepo.org\/class\/>\n\nSELECT ?topic ?progLang (COUNT(?progLang) AS ?langCount)\nWHERE {\n  GRAPH <https:\/\/semrepo.org> {\n    ?repository rdf:type srclass:repository .\n    ?repository foaf:topic ?topic .\n    ?repository sr:hasLanguageReference ?langref .\n    ?langref sr:hasLanguageName ?progLang .\n  }\n}\nGROUP BY ?topic ?progLang\nORDER BY DESC(?langCount)\nLIMIT 100<\/code><\/pre>\n\n\n\n
Federated query of SemRepo-LinkedPapersWithCode-SemOpenAlex<\/mark><\/em><\/p>\n\n\n\n
Retrieve additional metadata about the LPWC repository entity <https:\/\/linkedpaperswithcode.com\/repository\/github.com\/clarinsi\/classla> from SemRepo, Linked Papers With Code, and SemOpenAlex.<\/p>\n\n\n\n
PREFIX dct: <http:\/\/purl.org\/dc\/terms\/>\nPREFIX fabio: <http:\/\/purl.org\/spar\/fabio\/>\nPREFIX owl: <http:\/\/www.w3.org\/2002\/07\/owl#>\nPREFIX lpwc: <https:\/\/linkedpaperswithcode.com\/property\/>\nPREFIX foaf: <http:\/\/xmlns.com\/foaf\/0.1\/>\nPREFIX soa: <https:\/\/semopenalex.org\/ontology\/>\nPREFIX xsd: <http:\/\/www.w3.org\/2001\/XMLSchema#>\nPREFIX sr: <https:\/\/semrepo.org\/property\/>\n\nSELECT ?paper ?paperTitle ?firstAuthor ?firstAuthorName (GROUP_CONCAT(DISTINCT ?institutionName; separator=\", \") AS ?institutionNames) ?url ?stars ?forks ?contributers ?PrimaryLanguageName\nWHERE {\n\nGRAPH <https:\/\/semrepo.org> {\n  ?semrepoRepository fabio:hasURL ?url .\n  ?semrepoRepository sr:hasLpwcUrl <https:\/\/linkedpaperswithcode.com\/repository\/github.com\/clarinsi\/classla> .\n  ?semrepoRepository sr:hasTotalStargazers ?stars .\n  ?semrepoRepository sr:hasTotalForks ?forks .\n  ?semrepoRepository sr:hasTotalContributor ?contributers .\n  ?semrepoRepository sr:hasPrimaryProgrammingLanguage ?primaryLanguageReference .\n  ?primaryLanguageReference sr:hasLanguageName ?PrimaryLanguageName .\n} \n\nSERVICE <https:\/\/linkedpaperswithcode.com\/sparql> {\n  ?paper a <https:\/\/linkedpaperswithcode.com\/class\/paper> .\n  ?paper dct:title ?paperTitle .\n  ?paper lpwc:hasOfficialRepository <https:\/\/linkedpaperswithcode.com\/repository\/github.com\/clarinsi\/classla> .\n  ?paper owl:sameAs ?paperSemOpenAlex .\n}\n  \nSERVICE <https:\/\/semopenalex.org\/sparql> {\n  ?paperSemOpenAlex soa:hasAuthorship ?authorship .\n  ?authorship soa:position \"0\"^^xsd:integer .\n  ?authorship soa:hasAuthor ?firstAuthor .\n  ?firstAuthor foaf:name ?firstAuthorName .\n  ?firstAuthor <http:\/\/www.w3.org\/ns\/org#memberOf> ?firstAuthorInstitution .\n  ?firstAuthorInstitution foaf:name ?institutionName .\n}\n\n}  \nGROUP BY ?paper ?paperTitle ?firstAuthor ?firstAuthorName ?url ?stars ?forks ?contributers ?PrimaryLanguageName\nLIMIT 100<\/code><\/pre>\n\n\n\n
Top 5 contributors with most commits with SemOpenAlex profile<\/mark><\/em><\/p>\n\n\n\n
PREFIX sr: <https:\/\/semrepo.org\/property\/>\n\nSELECT ?contributor ?soa_url (SUM(?no_of_commits) AS ?total_commits)\nWHERE {\n  GRAPH <https:\/\/semrepo.org> {\n    ?contRef sr:hasContributor ?contributor .\n    ?contRef sr:hasCommits ?no_of_commits .\n    ?contributor sr:hasSoaUrl ?soa_url .\n  }\n}\nGROUP BY ?contributor ?soa_url\nORDER BY DESC(?total_commits)\nLIMIT 5<\/code><\/pre>\n\n\n\n
Template<\/mark><\/em>: Federated query of SemRepo-LinkedPapersWithCode<\/mark><\/em>-SemOpenAlex<\/mark><\/em><\/mark><\/em><\/p>\n\n\n\n
PREFIX rdf: <http:\/\/www.w3.org\/1999\/02\/22-rdf-syntax-ns#>\nPREFIX dct: <http:\/\/purl.org\/dc\/terms\/>\nPREFIX fabio: <http:\/\/purl.org\/spar\/fabio\/>\nPREFIX sr: <https:\/\/semrepo.org\/property\/>\nPREFIX srclass: <https:\/\/semrepo.org\/class\/>\nPREFIX org: <http:\/\/www.w3.org\/ns\/org#>\nPREFIX lpwc: <https:\/\/linkedpaperswithcode.com\/property\/>\n\nSELECT *\nWHERE {\n  GRAPH <https:\/\/semrepo.org> {\n    ?SemRepo_repository rdf:type srclass:repository .\n    ?SemRepo_repository fabio:hasURL ?Github_Url .\n    ?SemRepo_repository sr:hasTotalStargazers ?Stars .\n    ?SemRepo_repository sr:hasTotalWatchers ?Watchers .\n    ?SemRepo_repository sr:hasTotalForks ?Forks .\n    ?SemRepo_repository sr:hasTotalContributor ?Contributor .\n    ?SemRepo_repository sr:hasTotalIssues ?TotalIssues .\n    ?SemRepo_repository sr:hasLpwcUrl ?Lpwc_repository .\n    ?SemRepo_repository dct:creator ?SemRepo_person .\n    ?SemRepo_person sr:hasSoaUrl ?Soa_Author .\n  }\n\n  SERVICE <https:\/\/semopenalex.org\/sparql> {\n    ?Soa_Author org:memberOf ?Institution .\n  } \n\n  SERVICE <https:\/\/linkedpaperswithcode.com\/sparql> {\n    ?Lpwc_paper lpwc:hasOfficialRepository ?Lpwc_repository .\n    ?Lpwc_paper lpwc:hasTask ?Lpwc_Task .\n    ?Lpwc_paper lpwc:hasMethod ?Lpwc_Method .\n    ?Lpwc_paper lpwc:hasEvaluation ?Lpwc_Evaluation .\n    ?Lpwc_paper lpwc:hasConference ?Lpwc_Conference .\n  } \n}\nLIMIT 100<\/mark><\/em><\/mark><\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
The public SPARQL endpoint of the SemRepo Knowledge Graph is provided at https:\/\/semrepo.org\/sparql Example (Federated) SPARQL queries: Programming Languages Used for each topic Federated query of SemRepo-LinkedPapersWithCode-SemOpenAlex Retrieve additional metadata about the LPWC repository entity <https:\/\/linkedpaperswithcode.com\/repository\/github.com\/clarinsi\/classla> from SemRepo, Linked Papers With Code, and SemOpenAlex. Top 5 contributors with most commits with SemOpenAlex profile Template: Federated […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":4,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-23","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/semrepo.org\/index.php\/wp-json\/wp\/v2\/pages\/23","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/semrepo.org\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/semrepo.org\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/semrepo.org\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/semrepo.org\/index.php\/wp-json\/wp\/v2\/comments?post=23"}],"version-history":[{"count":26,"href":"https:\/\/semrepo.org\/index.php\/wp-json\/wp\/v2\/pages\/23\/revisions"}],"predecessor-version":[{"id":484,"href":"https:\/\/semrepo.org\/index.php\/wp-json\/wp\/v2\/pages\/23\/revisions\/484"}],"wp:attachment":[{"href":"https:\/\/semrepo.org\/index.php\/wp-json\/wp\/v2\/media?parent=23"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}