this.evaluator = evaluator;
lexicon = new Lexicon(model);
printStream = new RipplePrintStream(out, lexicon);
errorPrintStream = err;
connection = model.createConnection(new LexiconUpdater(lexicon));
initializeLexicon();
// TODO: the default value is a temporary fix for version conflicts due to property renaming
String defaultNamespace = Ripple.getConfiguration().getString(