// use the improved node type cache
// (replace with: entCache = new EffectiveNodeTypeCacheImpl();
// for the old one)
entCache = new BitSetENTCacheImpl();
registeredNTDefs = new ConcurrentReaderHashMap();
// setup definition of root node
rootNodeDef = createRootNodeDef();
// load and register pre-defined (i.e. built-in) node types