// use the improved node type cache
// (replace with: entCache = new EffectiveNodeTypeCacheImpl();
// for the old one)
entCache = new BitsetENTCacheImpl();
registeredNTDefs = new ConcurrentReaderHashMap();
propDefs = new ConcurrentReaderHashMap();
nodeDefs = new ConcurrentReaderHashMap();
// setup definition of root node
rootNodeDef = createRootNodeDef();
nodeDefs.put(rootNodeDef.getId(), rootNodeDef);