Hello, I managed to establish a connection to my MYSQL database via Jena SDB and inserted some triples.
However, I still feel insecure how OWL constructs are persisted with Jena. Here is my Java code example: c.initSdb(OntModelSpec.OWL_MEM_MICRO_RULE_INF); //connect to MYSQL db OntModel base = c.getOntologyModel(); String SOURCE = "http://www.eswc2006.org/technologies/ontology";; String NS = SOURCE + "#"; /* Add 2 individuals of the type "paper" linked via an object property */ OntClass paper = base.getOntClass( NS + "Paper" ); Individual p1 = base.createIndividual( NS + "paper1", paper ); Individual p2 = base.createIndividual( NS + "paper2", paper ); Property hasLinkTo = base.createObjectProperty(NS + "hasLinkTo"); // hasName property base.add(p1,hasLinkTo,p2); --- In the database 4 nodes, viz. - http://www.w3.org/1999/02/22-rdf-syntax-ns#type - http://www.eswc2006.org/technologies/ontology#hasLinkTo - http://www.w3.org/2002/07/owl#ObjectProperty - http://www.eswc2006.org/technologies/ontology#paper1 and 2 triples, viz. - #hasLinkTo - rdf-syntax-ns#type - owl#ObjectProperty - #paper1 - #hasLinkTo - #paper1 are persisted. My question is: Shouldn't the OntClass "Paper" result in an additional node, and an additional triple in the database? Or do I have to add this manually? How? I looked at the Jena tutorial but couldn't find an example. Best regards and thank you very much, Andreas
