* Implement getPropertyNames() to enable high level type.properties introspection

src/helma/objectmodel/db/DbMapping.java

@@ -747,6 +747,13 @@ public final class DbMapping {
         return subRelation;
     }
 
+    /**
+     * Return the list of defined property names as String array.
+     */
+    public String[] getPropertyNames() {
+        return (String[]) prop2db.keySet().toArray(new String[prop2db.size()]);
+    }
+
     /**
      *
      *