code: function isItemTag (tagName, prefix, local, feedType) {
    return tagName === 'item' || tagName === 'entry'
      || (local === 'item' && (prefix === '' || feedType === 'rdf'))
      || (local === 'entry' && (prefix === '' || feedType === 'atom'));
  }
docs: Determines whether or not the current tag is an item/entry
  
  @param tagName
  @param prefix
  @param local
  @param feedType
  @returns {boolean}