code: @Override
      public void include(InputStream is, String cs, String source) throws IOException
      {
          include(is, Charset.forName(cs), source);
      }
docs: Include InputStream at current input. InputStream is read as part of
  input. When InputStream ends, input continues using current input.
  
  <p>Included stream is closed at eof
  
  @param is Included input
  @param cs Character set
  @param source Description of the source
  @throws IOException