docs: @Override
    public void writeContent(XMLExtendedStreamWriter writer, SubsystemMarshallingContext context) throws XMLStreamException {
  
      context.startSubsystemElement(Namespace.CURRENT.getUriString(), false);
      
      writeProcessEnginesContent(writer, context);
      
      writeJobExecutorContent(writer, context);
      
      // end subsystem
      writer.writeEndElement();
    }