jReponseRss20's property infos is an object allowing to set the RSS feed's properties: title, website url, copyright, description, etc.

For example:

   $resp->infos->title = 'Jelix news';
   $resp->infos->webSiteUrl= 'http://jelix.org/';
   $resp->infos->copyright = 'Copyright 2017 jelix.org';
   $resp->infos->description = 'News about Jelix, fresh meat for hairy trolls.';
   $resp->infos->updated = '2017-06-08 12:00:00';
   $resp->infos->published = '2017-06-08 12:00:00';
   $resp->infos->ttl = 60;

Property ttl is the cache-timeout, in minutes. Property description should be a string; however it's possible to specify the format (HTML or XHTML) in property descriptionType. Property descriptionType expects any of the following values : "html", "xhtml" ou "text".

The RSS channel should be fed with items to publish. For example, items can have the description of each new tickets of a blog.

Each item should be created with jResponseRss20's method: createItem(). It allows to fetch an object with item's informations. You can fill this object and add it the the response with jResponseRss20's method : addItem().

For example, with a news DAO:

  $newsdao = jDao::get('news');
  $first = true;

  /*
  Fetch the ten last news from the DAO,
  assuming it's ordered from the newest to the oldest.
  (method defined in the DAO)
  */
  $list = $newsdao->findTenFirstNews();

  foreach($list as $news){

    if($first){
        /*
        The first record allow to fetch channel's date
        */
        $resp->infos->updated = $news->date_create;
        $resp->infos->published = $news->date_create;
        $first = false;
    }

    // Fetch the URL from the news article
    $url = jUrl::get('news~default:article', array('newsid'=>$news->id));

    // Create an RSS item, specifying the title, url, and date (format : [yyyy-mm-jj hh-mm-ss] )
    $item = $rep->createItem($news->title, $url, $news->date_create);

    // News author
    $item->authorName = $news->author;

    // Item's contents
    $item->content = $news->content;
    $item->contentType ='html';

    /*
    Assuming the news-URL being the news-ID in this example.
    Note that it would have been possible to use : $item->id =$news->id
    */
    $item->idIsPermalink = true;

    // Add this item to the feed.
    $resp->addItem($item);
  }

It's possible to explicitely specify more informations about the RSS food or about each item.

Check the API documentation about jRSS20Info and jRSSItem to go deeper.