added native_subject generation from about section

dnet-ariadneplus-graphdb-publisher/src/main/resources/eu/dnetlib/ariadneplus/sparql/enrich/ADS/ordered_sparql_insert_321.sparql

@@ -45,6 +45,21 @@ WHERE {
     ?collection aocat:has_ARIADNE_subject ?archeologicalResourceType .
 };
 
+PREFIX aocat: <https://www.ariadne-infrastructure.eu/resource/ao/cat/1.1/>
+PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
+
+INSERT {
+    GRAPH <https://ariadne-infrastructure.eu/api_________::ariadne_plus::ads::321> {
+        ?s aocat:has_native_subject ?ns .
+    }
+}
+USING <https://ariadne-infrastructure.eu/api_________::ariadne_plus::ads::321>
+WHERE {
+ ?s aocat:is_about ?about .
+ ?about aocat:has_type ?ns .
+ ?ns rdf:type aocat:AO_Concept .
+};
+
 PREFIX  aocat: <https://www.ariadne-infrastructure.eu/resource/ao/cat/1.1/>
 PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
 PREFIX  skos: <http://www.w3.org/2004/02/skos/core#>