code: function parseItem (node, currentItem) {
      // REMARK: note the raw dom node instead of $node to guarantee uniqueness
      if (currentItem && currentItem.hasMemoryOf(node)) {
        return Item.ERROR;
      }
  
      var $node = $(node);
      var type = splitUnique($node.attr('itemtype'));
      type = type && type.filter(isAbsoluteUrl);
  
      var item = new Item({
        type: type,
        id: $node.attr('itemid'),
        node: node,
        parent: currentItem
      });
  
      walkNodes($node.children(), item);
  
      // visit all nodes referenced by the current one
      var refs = splitUnique($node.attr('itemref'));
      if (refs) {
        var refsSelector = refs
          .map(function makeIdSelector (id) {
            return '#' + id;
          })
          .join(',');
  
        walkNodes($(refsSelector), item);
      }
  
      return item;
    }
docs: parses a microdata item out of an itemscope DOM node