// prepare HDB
TMLScriptHDBListenerFactory listenerFactory = new TMLScriptHDBListenerFactory(this);
WGHierarchicalDatabase.setDefaultListenerFactory(listenerFactory);
WGHierarchicalDatabase.setDefaultStartupImpl(null);
_hdbCoreListener = new WGHierarchicalDatabaseCoreListener() {
public void databaseCreated(WGHierarchicalDatabase hdb) {
// Eventually load and initialize model
WGDatabase db = hdb.getWrappedDB();
try {