@Override public String toString(){
  if (m_bGenerateNet) {
    return toXMLBIF03();
  }
  return m_Instances.toString();
}

@ Override public String toString ( ) { if ( m_bGenerateNet ) { return toXMLBIF03 ( ) ; } return m_Instances . toString ( ) ; }
returns either the net ( if bif format ) or the generated instances
