attributes.addElement(m_BaseFormat.classAttribute());
attributes.addElement(m_BaseFormat.classAttribute().copy());
  protected Instances metaFormat(Instances instances) throws Exception {    FastVector attributes = new FastVector();    Instances metaFormat;    Attribute attribute;    int i = 0;    for (int k = 0; k < m_Classifiers.length; k++) {      Classifier classifier = (Classifier) getClassifier(k);      String name = classifier.getClass().getName();      if (m_BaseFormat.classAttribute().isNumeric()) {	attributes.addElement(new Attribute(name));      } else {	for (int j = 0; j < m_BaseFormat.classAttribute().numValues(); j++) {	  attributes.addElement(new Attribute(name + ":" + 					      m_BaseFormat					      .classAttribute().value(j)));	}      }    }    attributes.addElement(m_BaseFormat.classAttribute());    metaFormat = new Instances("Meta format", attributes, 0);    metaFormat.setClassIndex(metaFormat.numAttributes() - 1);    return metaFormat;  }