diff --git a/data/tbox.ttl b/data/tbox.ttl
index 1a5e86a..e6fd303 100644
--- a/data/tbox.ttl
+++ b/data/tbox.ttl
@@ -5,13 +5,6 @@
 @prefix foaf:	<http://xmlns.com/foaf/0.1/> .
 @prefix rev:	<http://purl.org/stuff/rev#> .
 
-# Our classes
-:GameConsole	rdf:type rdf:Class .
-
-:PortableGameConsole	rdf:type rdf:Class ;
-			rdfs:subclassOf :GameConsole .
-
-
 # Our own properties
 :ceo    rdf:type    rdf:Property ;
         rdfs:domain foaf:Organization ;
diff --git a/src/main/java/hsh/ins_jena/model/Generator.java b/src/main/java/hsh/ins_jena/model/Generator.java
index 3673800..c478f33 100644
--- a/src/main/java/hsh/ins_jena/model/Generator.java
+++ b/src/main/java/hsh/ins_jena/model/Generator.java
@@ -29,15 +29,20 @@ public class Generator {
 		Resource rdfProperty = model.createResource(rdfUri+"Property");
 		
 		Property rdfsSubclassOf = model.createProperty(rdfsUri+"subclassOf");
+		Property rdfsSubPropertyOf = model.createProperty(rdfsUri+"subPropertyOf");
 		Property rdfsDomain = model.createProperty(rdfsUri+"domain");
 		Property rdfsRange = model.createProperty(rdfsUri+"range");
+		Property rdfsLabel = model.createProperty(rdfsUri+"label");
+		Property rdfsDatatype = model.createProperty(rdfsUri+"Datatype");
 
+		
 		Resource foafPerson = model.createResource(foafUri+"Person");
 		Resource foafOrganization = model.createResource(foafUri+"Organization");
 
 		Resource xsdInt = model.createResource(xsdUri+"int");
 		Resource xsdBoolean = model.createResource(xsdUri+"boolean");
 		Resource xsdString = model.createResource(xsdUri+"string");
+
 		
 		// Own classes
 		Resource gameConsole = model.createResource(ownUri+"GameConsole");
@@ -99,6 +104,15 @@ public class Generator {
 		madeBy.addProperty(rdfsDomain, gameConsole);
 		madeBy.addProperty(rdfsRange, foafOrganization);
 
+		// Declare our datatype
+		Resource priceEur = model.createResource(ownUri+"PriceEur");
+		priceEur.addProperty(rdfType, rdfsDatatype);
+		priceEur.addProperty(rdfsLabel, "Preis in Euro");
+
+		// Use of subPropertyOf
+		predecessorOfConsole.addProperty(rdfsSubPropertyOf, relatedToConsole);
+		successorOfConsole.addProperty(rdfsSubPropertyOf, relatedToConsole);
+
 		// Store the model into a file
 		Generator.writeModelToFile(model, "./output/tbox.ttl");
 	}