code: function parseXmlUrl (node, nodeType, feedType) {
    var getLink = function (linkNode) {
      var link;
  
      utils.parse(linkNode, function (linkEl) {
        var linkAttr = linkEl['@'];
  
        if (linkAttr.href && linkAttr.rel === 'self') {
          link = linkAttr.href;
          return;
        }
      }, this, true);
  
      return link;
    };
  
    return getLink(node.link) || getLink(node['atom:link']) || getLink(node['atom10:link']);
  }
docs: Parses the xmlUrl of a meta node.
  
  - link
  - highest priority and quantity in RSS and ATOM feeds for both meta and item nodes.
  - atom:link
  - next highest priority and quantity in RSS feeds for meta nodes.
  - rarely found in ATOM feeds or item nodes if ever.
  - atom10:link
  - next highest priority in RSS feeds for meta nodes.
  - rarely found in ATOM feeds or item nodes if ever.
  
  @param node
  @param nodeType
  @param feedType
  @returns {string}