. . . . "This query returns all places (geosparql:Feature) located in Africa." . . . "Get places in Africa" . . "prefix np: \r\nprefix npa: \r\nprefix npx: \r\nprefix dct: \r\nprefix geosparql: \r\nprefix rdfs: \r\nprefix geof: \r\n\r\nselect distinct ?np ?location ?locationLabel ?wkt where {\r\n graph ?assertion {\r\n ?paper dct:spatial ?location .\r\n ?location a geosparql:Feature .\r\n ?location rdfs:label ?locationLabel .\r\n ?location geosparql:hasGeometry ?geometry .\r\n ?geometry geosparql:asWKT ?wkt .\r\n # Find locations that intersect with East Africa bounding box\r\n filter(geof:sfIntersects(strdt(?wkt, geosparql:wktLiteral), \"POLYGON((28 -12, 40 -12, 40 5, 28 5, 28 -12))\"^^geosparql:wktLiteral))\r\n }\r\n graph npa:graph {\r\n ?np np:hasAssertion ?assertion .\r\n ?np npa:hasValidSignatureForPublicKey ?pubkey .\r\n filter not exists { ?npx npx:invalidates ?np ; npa:hasValidSignatureForPublicKey ?pubkey . }\r\n }\r\n}" . . "Tobias Kuhn" . "2025-08-22T11:53:32.209Z"^^ . . . . . . . . . "RSA" . "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQD4Wj537OijfOWVtsHMznuXKISqBhtGDQZfdO6pbb4hg9EHMcUFGTLbWaPrP783PHv8HMAAPjvEkHLaOHMIknqhaIa5236lfBO3r+ljVdYBElBcLvROmwG+ZGtmPNZf7lMhI15xf5TfoaSa84AFRd5J2EXekK6PhaFQhRm1IpSYtwIDAQAB" . "RzSn2h9jqSfPAEymPcRewnjV67FYiUK5gS2z6HVBgodOmJ6N+53p1z+YTzX673ym+s0ZtArDeZFGRJ7GoOFY0lWOoLdcy4wMrfixCP3E0/gknvvtUjGMSIFNrXfT/nnYRRBcly39g8xqO4wmSdDqq/rBM99cU/s5+qdtyuUoYAo=" . . .