code: public void addSubscriptionDriver() {
  
          setExtProperty("driver.subscription", "db");
          String dbName = getExtProperty("db.name");
          String packageName = getDbPackage(dbName);
          setExtProperty("db.subscription.driver", "org.opencms.db." + packageName + ".CmsSubscriptionDriver");
          setExtProperty("db.subscription.pool", "opencms:default");
          setExtProperty("db.subscription.sqlmanager", "org.opencms.db." + packageName + ".CmsSqlManager");
      }
docs: Adds the subscription driver to the properties.<p>