added missing prefix

dnet-ariadneplus-graphdb-publisher/src/main/resources/eu/dnetlib/ariadneplus/sparql/enrich/ADS/ordered_sparql_insert_304.sparql

@@ -86,6 +86,10 @@ 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#>
+PREFIX skos: <http://www.w3.org/2004/02/skos/core#>
+
 INSERT {
     GRAPH <https://ariadne-infrastructure.eu/api_________::ariadne_plus::ads::304> {
       ?s	aocat:has_native_subject <https://ariadne-infrastructure.eu/aocat/Concept/ads/NOT_PROVIDED> .