Fixed createUsageKnowledge

src/main/java/org/gcube/informationsystem/utils/documentation/knowledge/Tree.java

@@ -40,13 +40,13 @@ public class Tree {
 	}
 	
 	public void addNode(Type type) {
+		createUsageKnowledge(type);
+		
 		if(root.getType().getName().compareTo(type.getName())==0) {
 			// Root has been already added
 			return;
 		}
 		
-		createUsageKnowledge(type);
-		
 		Set<String> superClasses = type.getSuperClasses();
 		
 		String name = type.getName();