code: public static Xml exports(ProducibleConfig config)
      {
          Check.notNull(config);
  
          final Xml node = new Xml(NODE_PRODUCIBLE);
          node.writeInteger(ATT_STEPS, config.getSteps());
  
          return node;
      }
docs: Export the producible node from config.
  
  @param config The config reference (must not be <code>null</code>).
  @return The producible node.
  @throws LionEngineException If unable to write node.