@Override
 public TreebankReader getXmlReader(File file, String sentenceNumber) {
   TreebankXmlReader treebankXmlReader = (TreebankXmlReader) this.getXmlReader(file);
   treebankXmlReader.setSentenceNumber(sentenceNumber);
   return treebankXmlReader;
 }
 @Override
 public TreebankReader getXmlReader(File file) {
   TreebankXmlReader treebankXmlReader = new TreebankXmlReader(file);
   treebankXmlReader.setTreebankService(this.getTreebankService());
   return treebankXmlReader;
 }